CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (65,637)	$ (49,620)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,428	2,705
Stock-based compensation	18,557	7,891
Change in right-of-use asset	1,292	1,388
Interest expense on notes and convertible debt	36	840
Amortization of debt issuance costs and debt discount	250	335
Change in fair value of warrant liabilities	406	6,097
Change in fair value of derivative liability	0	5,308
Gain on extinguishment of tranche right liability	0	(1,610)
Inventory write down	866	1,156
Changes in operating assets and liabilities:
Accounts receivable	(4,378)	(2,023)
Inventory	(2,551)	(4,064)
Prepaid expenses and other assets	42	21
Accounts payable	(2,707)	(625)
Accrued and other liabilities	7,060	(2,001)
Operating lease liability	(1,770)	(429)
Net cash used in operating activities	(45,106)	(34,631)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(1,774)	(2,394)
Net cash used in investing activities	(1,774)	(2,394)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from the merger and private offering	291,454	0
Payment of offering costs	(27,124)	0
Repayment of debt	(7,000)	(3,000)
Proceeds from issuance of promissory notes to related parties	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	539	9
Issuance of common stock upon exercise of restricted stock awards	0	8
Proceeds from issuance of Series B redeemable convertible preferred stock, net of issuance cost of $265	0	41,526
Net cash provided by financing activities	257,826	38,543
Net increase in cash, cash equivalents and restricted cash	210,946	1,518
Cash, cash equivalents and restricted cash at beginning of period	12,642	18,405
Cash, cash equivalents and restricted cash at end of period	223,588	19,923
SUPPLEMENTAL DISCLOSURES OF OPERATING ACTIVITIES:
Cash paid for interest	635	1,020
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION:
Property and equipment purchases included in accounts payable and accrued liabilities	334	12
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	40,016
Right-of-use assets obtained in exchange for operating lease liability	0	6,234
Issuance of common stock pursuant to the conversion of convertible notes and accrued interest	$ 0	$ 78,311