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	$ (20,957)	$ (18,693)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,095	822
Stock-based compensation	5,256	175
Change in right-of-use asset	520	436
Interest expense on notes and convertible debt	36	905
Amortization of debt issuance costs and debt discount	250	94
Change in fair value of warrant liabilities	4,152	0
Change in fair value of derivative liability	0	5,308
Inventory obsolescence impairment	0	1,483
Changes in operating assets and liabilities:
Accounts receivable	(140)	(463)
Inventory	(476)	(2,980)
Prepaid expenses and other assets	(1,202)	(27)
Accounts payable	(1)	590
Accrued and other liabilities	(254)	351
Operating lease liability	(678)	165
Net cash used in operating activities	(12,399)	(11,834)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(597)	(1,393)
Net cash used in investing activities	(597)	(1,393)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from the merger and private offering	291,454	0
Payment of offering costs	(26,116)	0
Repayment of debt	(7,000)	0
Proceeds from convertible notes payable	5,000	0
Repayment of promissory notes to related parties	(5,000)	0
Repurchase of common stock	(43)	0
Proceeds from exercise of stock options	504	2
Net cash provided by financing activities	258,799	2
Net increase (decrease) in cash, cash equivalents and restricted cash	245,803	(13,225)
Cash, cash equivalents and restricted cash at beginning of period	12,642	18,405
Cash, cash equivalents and restricted cash at end of period	258,445	5,180
SUPPLEMENTAL DISCLOSURES OF OPERATING ACTIVITIES:
Cash paid for interest	635	278
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Property and equipment purchases included in accounts payable and accrued liabilities	100	244
Private placement warrants acquired as part of the merger	19,377	0
Issuance of redeemable convertible preferred stock upon exercise of warrants	58,097	0
Conversion of redeemable convertible preferred stock to common stock	97,322	0
Offering costs not yet paid	504	0
Reclassification of common stock on exercise of stock options with notes receivable from stockholders	$ 0	$ 44