Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (75,923)	$ (15,581)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	657	628
Noncash lease expense related to operating right-of-use assets	890
Amortization of premium (discount) on marketable securities	262	(14)
Unrealized loss on marketable securities	278	0
Change in fair value of warrants	46,649	309
Impairment of inventories	257	225
Share-based compensation	1,837	1,128
Other	575	117
Changes in operating assets and liabilities:
Accounts receivable	3,828	(1,560)
Inventories	(442)	(2,508)
Prepaid expenses and other current assets	(5,797)	(760)
Other non-current assets	(1,318)	74
Accounts payable	1,766	(28)
Accrued and other current liabilities	(813)	444
Other non-current liabilities	(720)	(7)
Net cash used in operating activities	(28,014)	(17,533)
Cash flows from investing activities:
Purchases of marketable securities	(226,245)	0
Proceeds from maturities of marketable securities	69,275	0
Proceeds from sales of marketable securities	29,505	2,319
Purchases of property and equipment	(889)	(898)
Net cash provided by (used in) investing activities	(128,354)	1,421
Cash flows from financing activities:
Repayment of debt	(75)	(2,678)
Principal payments on finance leases (capital lease prior to adoption of ASC 842)	(67)
Principal payments on finance leases (capital lease prior to adoption of ASC 842)		(49)
Proceeds from exercise of warrants	153,927	0
Proceeds from exercise of stock options	321	0
Repurchase of common stock and redemption of warrants	(2)	(1)
Net cash provided by (used in) financing activities	154,104	(2,728)
Net decrease in cash and cash equivalents, and restricted cash and cash equivalents	(2,264)	(18,840)
Beginning cash and cash equivalents, and restricted cash and cash equivalents	209,719	27,305
Ending cash and cash equivalents, and restricted cash and cash equivalents	207,455	8,465
Supplemental disclosures of cash flow information:
Cash paid for interest	19	329
Supplemental disclosures of noncash investing and financing activities:
Issuance of Class A common stock upon exercise of warrants	338,293	0
Operating lease right-of-use assets obtained in exchange for lease obligations	$ 2,876
Accounting Standards Update [Extensible List]	Upon adoption of ASC 842
Deferred financing costs recorded in accrued liabilities	$ 223	0
Assets acquired under finance leases (capital lease prior to adoption of ASC 842)		133
Purchases of property and equipment recorded in accounts payable and accrued liabilities	504	$ 35
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	$ 10,849