Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income (Loss) Attributable to Parent	$ (28,859)	$ (25,774)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	961	1,244
Stock-based compensation	3,337	5,032
Accretion on asset retirement obligation	25	23
Change in fair value of warrant liabilities	(1,944)	(2,830)
Provision on credit losses on accounts receivable	431	0
Amortization of debt discount and interest accrual	346	246
Changes in operating assets and liabilities:
Accounts receivable	(6,575)	(6,343)
Inventory	(10,785)	3,640
Deposits on purchased inventory	(1,258)	(2,375)
Deferred cost of revenue	(1,238)	(2,097)
Prepaid expenses and other assets	(490)	(4,739)
Accounts payable	(2,414)	8
Accrued expenses and other long-term liabilities	(3,821)	(8,247)
Customer deposits and deferred revenue	(1,315)	9,827
Net cash used in operating activities	(53,599)	(32,385)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(1,177)	(1,218)
Net cash used in investing activities	(1,177)	(1,218)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment on credit revolver	(722)	0
Proceeds from the exercise of stock options	288	56
Payments for taxes related to net share settlement of equity awards	(1,751)	(1,604)
Net cash used in financing activities	(2,185)	(1,548)
NET DECREASE IN CASH DURING THE PERIOD	(56,961)	(35,151)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — BEGINNING OF PERIOD	142,495	219,808
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — END OF PERIOD	85,534	184,657
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest	2,093	819
SUPPLEMENTAL NON-CASH INVESTING AND FINANCING ACTIVITIES:
Fair value of common stock warrants reclassified from liability to additional paid-in capital upon exercise	0	0
Right-of-use assets obtained in exchange for new operating lease liabilities	0	0
Transfer of property and equipment from inventory and deferred cost of revenue	(104)	(103)
Purchases of property and equipment in accounts payable and accrued liabilities	$ 11	$ 161