Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net loss	$ (38,832)	$ (24,576)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	10,678	11,390
Provision for credit losses and inventory	502	375
Stock-based compensation expense	6,096	8,253
Stock-based sales incentive charges	13,730	3,756
Change in fair value of derivative instruments	2,532	1,036
Amortization of discount and debt issuance cost	(1,213)	(47)
Gain on disposal of property and equipment	(49)	(32)
Loss on extinguishment of debt	0	2,268
Asset impairments and other charges	409	0
Loss from equity method investments	1,890	1,677
Non-cash lease expense	1,402	827
Deferred income taxes	(86)	21
Changes in operating assets and liabilities:
Accounts and other receivables	(19,704)	12,875
Inventory	(2,626)	(1,809)
Prepaid expenses and other assets	1,040	(3,188)
Operating lease liabilities	(1,105)	(971)
Accounts payable	(606)	113
Deferred revenue	129	801
Accrued liabilities and other	6,809	(7,930)
Net cash provided by operating activities	(19,004)	4,839
Cash flows from investing activities:
Purchases of short-term investments	(49,393)	(99,803)
Maturities and sales of short-term investments	135,500	109,000
Purchases of and deposits on property and equipment	(17,777)	(7,366)
Disbursements for loans receivable	(1,140)	0
Grant proceeds for capital projects	1,947	0
Payments on and proceeds from sales of loans receivable	1,483	103
Cash received from sale of certain assets of subsidiary, net	0	3,885
Payment and deposits on equipment and manure rights for RNG production projects	(10,147)	(4,500)
Proceeds from disposal of property and equipment	49	43
Net cash provided by (used in) investing activities	60,522	1,362
Cash flows from financing activities:
Issuance of common stock	332	273
Repurchase of common stock	0	(3,001)
Fees paid for issuance of common stock	(175)	0
Fees paid for debt issuance costs	(369)	(50)
Proceeds for Adopt-A-Port program	100	240
Repayment of proceeds for Adopt-A-Port program	(343)	(235)
Proceeds from debt instruments	0	14,000
Repayments of debt instruments and finance lease obligations	(317)	(13,848)
Payments of debt extinguishment costs	0	(2,186)
Net cash provided by (used in) financing activities	(772)	(4,807)
Effect of exchange rates on cash, cash equivalents and restricted cash	111	120
Net increase (decrease) in cash, cash equivalents and restricted cash	40,857	1,514
Cash, cash equivalents and restricted cash, beginning of period	125,950	106,456
Cash, cash equivalents and restricted cash, end of period	166,807	107,970
Supplemental disclosure of cash flow information:
Income taxes paid	26	0
Interest paid, net of $57, $0 and $0 capitalized, respectively	$ 4,106	$ 470