Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net loss	$ (88,333)	$ (75,923)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	805	657
Noncash lease expense related to operating lease right-of-use assets	885	890
Amortization of premium on marketable securities	444	262
Change in fair value of warrants	3,857	46,649
Vendor stock-in-lieu of cash program	7,848	0
Amortization of debt discount and issuance costs	809	0
Impairment of inventories	1,356	257
Share-based compensation	26,698	1,837
Product warranty and other	107	853
Changes in operating assets and liabilities:
Accounts receivable	9,757	3,828
Inventories	(768)	(442)
Prepaid expenses and other current assets	(3,300)	(5,797)
Other non-current assets	158	(1,318)
Accounts payable	5,983	1,766
Accrued and other current liabilities	1,200	(813)
Other non-current liabilities	(343)	(720)
Net cash used in operating activities	(32,837)	(28,014)
Cash flows from investing activities:
Purchases of marketable securities	(193,687)	(226,245)
Proceeds from maturities of marketable securities	91,454	69,275
Proceeds from sales of marketable securities	12,842	29,505
Purchases of property and equipment	(5,004)	(889)
Net cash used in investing activities	(94,395)	(128,354)
Cash flows from financing activities:
Proceeds from exercise of warrants	0	153,927
Proceeds from exercise of stock options	1,092	321
Payments of employee taxes related to vested restricted stock units	(516)	0
Repurchase of common stock and redemption of warrants	(43,920)	(2)
Other financing activities	0	(142)
Net cash provided by (used in) financing activities	(43,344)	154,104
Net decrease in cash, cash equivalents and restricted cash	(170,576)	(2,264)
Beginning cash, cash equivalents and restricted cash	330,702	209,719
Ending cash, cash equivalents and restricted cash	160,126	207,455
Supplemental disclosures of cash flow information:
Cash paid for interest	0	19
Supplemental disclosures of noncash investing and financing activities:
Issuance of Class A common stock upon exercise of warrants	18,689	338,293
Operating lease right-of-use assets obtained in exchange for lease obligations	5,746	2,876
Deferred financing costs recorded in accrued liabilities	0	223
Purchases of property and equipment recorded in accounts payable and accrued liabilities	$ 1,950	504
Accounting Standards Update [Extensible List]	Upon adoption of ASC 842
Upon adoption of ASC 842
Supplemental disclosures of noncash investing and financing activities:
Operating lease right-of-use assets obtained in exchange for lease obligations	$ 0	$ 10,849