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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities:    
Net loss $ (18,616) $ (38,832)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 11,182 10,678
Provision for credit losses and inventory 274 502
Stock-based compensation expense 2,629 6,096
Stock-based sales incentive charges 12,897 13,730
Change in fair value of derivative instruments (1,622) 2,532
Amortization of discount and debt issuance cost (948) (1,213)
Gain on disposal of property and equipment 64 (49)
Asset impairments and other charges 0 333
Loss from equity method investments 5,398 1,890
Non-cash lease expense 2,178 1,402
Deferred income taxes (201) (86)
Accretion of ARO liabilities 81 76
Changes in operating assets and liabilities:    
Accounts and other receivables 12,574 (19,704)
Inventory (3,965) (2,626)
Prepaid expenses and other assets (735) 1,040
Operating lease liabilities (1,593) (1,105)
Accounts payable (11,744) (606)
Deferred revenue 2,832 129
Accrued liabilities and other (8,095) 6,809
Net cash provided by (used in) operating activities 2,590 (19,004)
Cash flows from investing activities:    
Purchases of short-term investments (158,306) (49,393)
Maturities and sales of short-term investments 159,072 135,500
Purchases of and deposits on property and equipment (18,208) (17,777)
Grant proceeds for capital projects 652 1,947
Disbursements for loans receivable (3,500) (1,140)
Proceeds from paydowns, maturities, and sales of loans receivables 253 1,483
Payment and deposits on equipment and manure rights for RNG production projects (808) (10,147)
Proceeds received for joint development and construction of station projects 663 0
Proceeds from settlement of insurance claims 314 0
Proceeds from disposal of property and equipment 18 49
Net cash (used in) investing activities (19,850) 60,522
Cash flows from financing activities:    
Issuance of common stock 36 332
Payments of tax withholdings on net settlement of equity awards (304) (175)
Fees paid for lender and debt issuance costs (575) (369)
Proceeds for Adopt-a-Port program 3,390 100
Repayment of proceeds for Adopt-a-Port program (381) (343)
Repayments of debt instruments and finance lease obligations (334) (317)
Net cash (used in) financing activities 1,832 (772)
Effect of exchange rates on cash, cash equivalents and restricted cash (123) 111
Net (decrease) in cash, cash equivalents and restricted cash (15,551) 40,857
Cash, cash equivalents and restricted cash, beginning of period 106,963 125,950
Cash, cash equivalents and restricted cash, end of period 91,412 166,807
Supplemental disclosure of cash flow information:    
Income taxes paid 13 26
Interest paid, net of $138 and $661 capitalized, respectively $ 6,472 $ 4,106