| USD ($) $ in Thousands | Dec 31, 2025 | Dec 31, 2024 | Dec 31, 2023 | Dec 31, 2022 | Dec 31, 2021 | Dec 31, 2020 | Dec 31, 2019 | Dec 31, 2018 | Dec 31, 2017 | Dec 31, 2016 | Dec 31, 2015 | Dec 31, 2014 | Dec 31, 2013 | Dec 31, 2012 | Dec 31, 2011 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Current assets | |||||||||||||||
Assets | |||||||||||||||
Cash and cash equivalents | $ 16,513,000 | $ 16,139,000 | $ 16,398,000 | ||||||||||||
Short-term investments | 27,546,000 | 20,424,000 | 12,696,000 | ||||||||||||
Short-term marketable securities | - | - | - | ||||||||||||
Restricted cash | - | - | - | ||||||||||||
Restricted cash and marketable securities | - | - | - | ||||||||||||
Accounts receivable, net | 4,576,000 | 4,418,000 | 3,508,000 | ||||||||||||
Inventory | 12,392,000 | 12,017,000 | 13,626,000 | ||||||||||||
Prepaid expenses and other current assets | 7,615,000 | 5,362,000 | 3,388,000 | ||||||||||||
Total current assets | 68,642,000 | 58,360,000 | 49,616,000 | ||||||||||||
Property, plant and equipment, net | 40,643,000 | 35,836,000 | 29,725,000 | ||||||||||||
Operating lease net | - | - | - | ||||||||||||
Operating lease right-of-use assets | 6,027,000 | 5,160,000 | 4,180,000 | ||||||||||||
Digital assets | 1,008,000 | 1,076,000 | 184,000 | ||||||||||||
Intangible assets, net | - | 150,000 | 178,000 | ||||||||||||
Goodwill | - | 244,000 | 253,000 | ||||||||||||
Deferred tax assets | 6,925,000 | 6,524,000 | 6,733,000 | ||||||||||||
MyPower customer notes receivable, net of current portion | - | - | - | ||||||||||||
Restricted cash, net of current portion | - | - | - | ||||||||||||
Other non-current assets | 5,045,000 | 4,215,000 | 4,531,000 | ||||||||||||
Total assets | 137,806,000 | 122,070,000 | 106,618,000 | ||||||||||||
Liabilities | |||||||||||||||
Liabilities and Equity | |||||||||||||||
Current liabilities | |||||||||||||||
Accounts payable | 13,371,000 | 12,474,000 | 14,431,000 | ||||||||||||
Accrued liabilities and other | 13,279,000 | 10,723,000 | 9,080,000 | ||||||||||||
Deferred revenue | 3,424,000 | 3,168,000 | 2,864,000 | ||||||||||||
Resale value guarantees | - | - | - | ||||||||||||
Customer deposits | - | - | - | ||||||||||||
Current portion of debt and finance leases | 1,640,000 | 2,456,000 | 2,373,000 | ||||||||||||
Capital lease obligations, current portion | - | - | - | ||||||||||||
Convertible senior notes | - | - | - | ||||||||||||
Convertible debt, current portion | - | - | - | ||||||||||||
Long-term debt, current portion | - | - | - | ||||||||||||
Total current liabilities | 31,714,000 | 28,821,000 | 28,748,000 | ||||||||||||
Debt and finance leases, net of current portion | 6,736,000 | 5,757,000 | 2,857,000 | ||||||||||||
Deferred revenue, net of current portion | 3,631,000 | 3,317,000 | 3,251,000 | ||||||||||||
Convertible senior notes issued to related parties | - | - | - | ||||||||||||
Common stock warrant liability | - | - | - | ||||||||||||
Capital lease obligations, less current portion | - | - | - | ||||||||||||
Deferred revenue, net of current portion | - | - | - | ||||||||||||
Resale value guarantees, net of current portion | - | - | - | ||||||||||||
Convertible senior notes, less current portion | - | - | - | ||||||||||||
Resale value guarantee | - | - | - | ||||||||||||
Long-term debt, less current portion | - | - | - | ||||||||||||
Other long-term liabilities | 12,860,000 | 10,495,000 | 8,153,000 | ||||||||||||
Total liabilities | 54,941,000 | 48,390,000 | 43,009,000 | ||||||||||||
Redeemable noncontrolling interests in subsidiaries | 58,000 | 63,000 | 242,000 | ||||||||||||
Convertible senior notes (Note 12) | - | - | - | ||||||||||||
Equity | |||||||||||||||
Convertible senior notes (Notes 13) | - | - | - | ||||||||||||
Stockholders’ equity | |||||||||||||||
Preferred stock; $0.001 par value; 100 shares authorized; no shares issued and outstanding | 0 | 0 | 0 | ||||||||||||
Common stock; $0.001 par value; 6,000 shares authorized; 3,751 and 3,216 shares issued and outstanding as of December 31, 2025 and 2024, respectively | 3,000 | 3,000 | 3,000 | ||||||||||||
Additional paid-in capital | 42,770,000 | 38,371,000 | 34,892,000 | ||||||||||||
Accumulated other comprehensive income (loss) | 361,000 | (670,000) | (143,000) | ||||||||||||
Retained earnings | 39,003,000 | 35,209,000 | 27,882,000 | ||||||||||||
Total stockholders’ equity | 82,137,000 | 72,913,000 | 62,634,000 | ||||||||||||
Noncontrolling interests in subsidiaries | 670,000 | 704,000 | 733,000 | ||||||||||||
Total liabilities and equity | $ 137,806,000 | $ 122,070,000 | $ 106,618,000 |