| USD ($) $ in Thousands | Jun 30, 2026 | Mar 31, 2026 | Sep 30, 2025 | Jun 30, 2025 | Mar 31, 2025 | Sep 30, 2024 | Jun 30, 2024 | Mar 31, 2024 | Sep 30, 2023 | Jun 30, 2023 | Mar 31, 2023 | Sep 30, 2022 | Jun 30, 2022 | Mar 31, 2022 | Sep 30, 2021 | Jun 30, 2021 | Mar 31, 2021 | Sep 30, 2020 | Jun 30, 2020 | Mar 31, 2020 | Sep 30, 2019 | Jun 30, 2019 | Mar 31, 2019 | Sep 30, 2018 | Jun 30, 2018 | Mar 31, 2018 | Sep 30, 2017 | Jun 30, 2017 | Mar 31, 2017 | Sep 30, 2016 | Jun 30, 2016 | Mar 31, 2016 | Sep 30, 2015 | Jun 30, 2015 | Mar 31, 2015 | Sep 30, 2014 | Jun 30, 2014 | Mar 31, 2014 | Sep 30, 2013 | Jun 30, 2013 | Mar 31, 2013 | Sep 30, 2012 | Jun 30, 2012 | Mar 31, 2012 | Sep 30, 2011 | Jun 30, 2011 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Current assets | ||||||||||||||||||||||||||||||||||||||||||||||
Assets | ||||||||||||||||||||||||||||||||||||||||||||||
Cash and cash equivalents | $ 15,219,000 | $ 16,603,000 | $ 18,289,000 | $ 15,587,000 | $ 16,352,000 | $ 18,111,000 | $ 14,635,000 | $ 11,805,000 | $ 15,932,000 | $ 15,296,000 | $ 16,048,000 | $ 19,532,000 | ||||||||||||||||||||||||||||||||||
Short-term investments | 28,305,000 | 28,140,000 | 23,358,000 | 21,195,000 | 20,644,000 | 15,537,000 | 16,085,000 | 15,058,000 | 10,145,000 | 7,779,000 | 6,354,000 | - | ||||||||||||||||||||||||||||||||||
Short-term marketable securities | - | - | - | - | - | - | - | - | - | - | - | 1,575,000 | ||||||||||||||||||||||||||||||||||
Restricted cash | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Restricted cash and marketable securities | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Accounts receivable, net | 4,087,000 | 3,959,000 | 4,703,000 | 3,838,000 | 3,782,000 | 3,313,000 | 3,737,000 | 3,887,000 | 2,520,000 | 3,447,000 | 2,993,000 | 2,192,000 | ||||||||||||||||||||||||||||||||||
Inventory | 13,752,000 | 14,434,000 | 12,276,000 | 14,570,000 | 13,706,000 | 14,530,000 | 14,195,000 | 16,033,000 | 13,721,000 | 14,356,000 | 14,375,000 | 10,327,000 | ||||||||||||||||||||||||||||||||||
Prepaid expenses and other current assets | 7,395,000 | 6,612,000 | 6,027,000 | 5,943,000 | 4,905,000 | 4,888,000 | 4,325,000 | 3,752,000 | 2,708,000 | 2,997,000 | 3,227,000 | 2,364,000 | ||||||||||||||||||||||||||||||||||
Total current assets | 68,758,000 | 69,748,000 | 64,653,000 | 61,133,000 | 59,389,000 | 56,379,000 | 52,977,000 | 50,535,000 | 45,026,000 | 43,875,000 | 42,997,000 | 35,990,000 | ||||||||||||||||||||||||||||||||||
Property, plant and equipment, net | 47,255,000 | 43,213,000 | 39,407,000 | 38,574,000 | 37,088,000 | 36,116,000 | 32,902,000 | 31,436,000 | 27,744,000 | 26,389,000 | 24,969,000 | 21,926,000 | ||||||||||||||||||||||||||||||||||
Operating lease vehicles, net | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Operating lease right-of-use assets | 6,386,000 | 6,332,000 | 5,783,000 | 5,633,000 | 5,330,000 | 4,867,000 | 4,563,000 | 4,367,000 | 3,637,000 | 3,352,000 | 2,800,000 | 2,251,000 | ||||||||||||||||||||||||||||||||||
Digital assets | 674,000 | 786,000 | 1,315,000 | 1,235,000 | 951,000 | 184,000 | 184,000 | 184,000 | 184,000 | 184,000 | 184,000 | 218,000 | ||||||||||||||||||||||||||||||||||
Intangible assets, net | - | - | 131,000 | 138,000 | 144,000 | 158,000 | 164,000 | 171,000 | 191,000 | 202,000 | 204,000 | 228,000 | ||||||||||||||||||||||||||||||||||
Goodwill | - | - | 257,000 | 258,000 | 248,000 | 253,000 | 249,000 | 250,000 | 250,000 | 263,000 | 195,000 | 191,000 | ||||||||||||||||||||||||||||||||||
Deferred tax assets | 7,235,000 | 7,060,000 | 6,637,000 | 6,721,000 | 6,687,000 | 6,486,000 | 6,692,000 | 6,769,000 | - | - | - | - | ||||||||||||||||||||||||||||||||||
MyPower customer notes receivable, net of current portion | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Restricted cash, net of current portion | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Other non-current assets | 9,453,000 | 7,490,000 | 5,860,000 | 4,857,000 | 4,942,000 | 4,989,000 | 4,458,000 | 4,616,000 | 5,497,000 | 5,026,000 | 4,584,000 | 3,236,000 | ||||||||||||||||||||||||||||||||||
Total assets | 148,524,000 | 143,724,000 | 133,735,000 | 128,567,000 | 125,111,000 | 119,852,000 | 112,832,000 | 109,226,000 | 93,941,000 | 90,591,000 | 86,833,000 | 74,426,000 | ||||||||||||||||||||||||||||||||||
Liabilities | ||||||||||||||||||||||||||||||||||||||||||||||
Liabilities and Equity | ||||||||||||||||||||||||||||||||||||||||||||||
Current liabilities | ||||||||||||||||||||||||||||||||||||||||||||||
Accounts payable | 15,324,000 | 14,696,000 | 12,819,000 | 13,212,000 | 13,471,000 | 14,654,000 | 13,056,000 | 14,725,000 | 13,937,000 | 15,273,000 | 15,904,000 | 13,897,000 | ||||||||||||||||||||||||||||||||||
Accrued liabilities and other | 15,256,000 | 14,554,000 | 12,791,000 | 11,519,000 | 10,802,000 | 10,601,000 | 9,616,000 | 9,243,000 | 7,636,000 | 7,658,000 | 7,321,000 | 6,246,000 | ||||||||||||||||||||||||||||||||||
Deferred revenue | 3,427,000 | 3,441,000 | 3,756,000 | 3,237,000 | 3,243,000 | 3,031,000 | 2,793,000 | 3,024,000 | 2,206,000 | 2,176,000 | 1,750,000 | 1,928,000 | ||||||||||||||||||||||||||||||||||
Capital lease obligations | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Resale value guarantees | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Customer deposits | - | - | - | - | - | - | - | - | 894,000 | 1,026,000 | 1,057,000 | 1,083,000 | ||||||||||||||||||||||||||||||||||
Current portion of debt and finance leases | 1,418,000 | 1,447,000 | 1,924,000 | 2,040,000 | 2,237,000 | 2,291,000 | 2,264,000 | 2,461,000 | 1,967,000 | 1,459,000 | 1,404,000 | 1,457,000 | ||||||||||||||||||||||||||||||||||
Current portion of promissory notes issued to related parties | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Convertible senior notes and other debt | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Convertible senior notes | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Long-term debt, current portion | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Total current liabilities | 35,425,000 | 34,138,000 | 31,290,000 | 30,008,000 | 29,753,000 | 30,577,000 | 27,729,000 | 29,453,000 | 26,640,000 | 27,592,000 | 27,436,000 | 24,611,000 | ||||||||||||||||||||||||||||||||||
Debt and finance leases, net of current portion | 7,924,000 | 7,782,000 | 5,778,000 | 5,180,000 | 5,292,000 | 5,405,000 | 5,481,000 | 2,899,000 | 2,426,000 | 872,000 | 1,272,000 | 2,096,000 | ||||||||||||||||||||||||||||||||||
Convertible senior notes issued to related parties | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Deferred revenue, net of current portion | 4,073,000 | 3,847,000 | 3,746,000 | 3,764,000 | 3,610,000 | 3,350,000 | 3,357,000 | 3,214,000 | 3,059,000 | 3,021,000 | 2,911,000 | 2,265,000 | ||||||||||||||||||||||||||||||||||
Common stock warrant liability | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Capital lease obligations | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Deferred revenue, net of current portion | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Convertible senior notes and other debt | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Resale value guarantees, net of current portion | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Convertible senior notes, less current portion | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Long-term debt, net, less current portion | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Resale value guarantee | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Other long-term liabilities | 13,583,000 | 13,155,000 | 12,205,000 | 11,543,000 | 11,038,000 | 9,810,000 | 9,002,000 | 8,480,000 | 7,321,000 | 6,924,000 | 5,979,000 | 4,330,000 | ||||||||||||||||||||||||||||||||||
Total liabilities | 61,005,000 | 58,922,000 | 53,019,000 | 50,495,000 | 49,693,000 | 49,142,000 | 45,569,000 | 44,046,000 | 39,446,000 | 38,409,000 | 37,598,000 | 33,302,000 | ||||||||||||||||||||||||||||||||||
Redeemable noncontrolling interests in subsidiaries | 54,000 | 57,000 | 59,000 | 61,000 | 62,000 | 70,000 | 72,000 | 73,000 | 277,000 | 288,000 | 407,000 | 421,000 | ||||||||||||||||||||||||||||||||||
Convertible senior notes (Note 10) | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Equity | ||||||||||||||||||||||||||||||||||||||||||||||
Convertible senior notes (Notes 8) | - | - | - | - | - | - | - | - | - | - | - | - | ||||||||||||||||||||||||||||||||||
Stockholders’ equity | ||||||||||||||||||||||||||||||||||||||||||||||
Preferred stock; $0.001 par value; 100 shares authorized; no shares issued and outstanding | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||||||||||||||||||||||||||||
Common stock; $0.001 par value; 6,000 shares authorized; 3,949 and 3,751 shares issued and outstanding as of June 30, 2026 and December 31, 2025, respectively | 4,000 | 3,000 | 3,000 | 3,000 | 3,000 | 3,000 | 3,000 | 3,000 | 3,000 | 3,000 | 3,000 | 3,000 | ||||||||||||||||||||||||||||||||||
Additional paid-in capital | 45,859,000 | 44,299,000 | 41,597,000 | 40,363,000 | 39,456,000 | 37,286,000 | 36,443,000 | 35,763,000 | 34,201,000 | 33,436,000 | 32,878,000 | 31,592,000 | ||||||||||||||||||||||||||||||||||
Accumulated other comprehensive income | 401,000 | 334,000 | 207,000 | 158,000 | (424,000) | (14,000) | (467,000) | (399,000) | (692,000) | (410,000) | (225,000) | (942,000) | ||||||||||||||||||||||||||||||||||
Retained earnings | 40,594,000 | 39,480,000 | 38,163,000 | 36,790,000 | 35,618,000 | 32,656,000 | 30,489,000 | 29,011,000 | 19,954,000 | 18,101,000 | 15,398,000 | 9,198,000 | ||||||||||||||||||||||||||||||||||
Total stockholders’ equity | 86,858,000 | 84,116,000 | 79,970,000 | 77,314,000 | 74,653,000 | 69,931,000 | 66,468,000 | 64,378,000 | 53,466,000 | 51,130,000 | 48,054,000 | 39,851,000 | ||||||||||||||||||||||||||||||||||
Noncontrolling interests in subsidiaries | 607,000 | 629,000 | 687,000 | 697,000 | 703,000 | 709,000 | 723,000 | 729,000 | 752,000 | 764,000 | 774,000 | 852,000 | ||||||||||||||||||||||||||||||||||
Total liabilities and equity | $ 148,524,000 | $ 143,724,000 | $ 133,735,000 | $ 128,567,000 | $ 125,111,000 | $ 119,852,000 | $ 112,832,000 | $ 109,226,000 | $ 93,941,000 | $ 90,591,000 | $ 86,833,000 | $ 74,426,000 |