CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (19,458)	$ (6,852)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	215	187
Amortization of right-of-use assets	223
Change in fair value of warrant liability	(668)
Stock-based compensation	4,513	881
Changes in operating assets and liabilities:
Accounts receivable	(104)	20
Inventories	(310)	(199)
Other current assets	(258)	545
Other noncurrent assets	(296)	(5)
Accounts payable	964	(11)
Accrued liabilities	872	(225)
Accrued employee costs	(358)	(56)
Lease liability	(141)
Other current liabilities	9	(50)
Other noncurrent liabilities		52
Net cash used in operating activities	(14,797)	(5,713)
Cash flows from investing activities:
Purchase of property, plant and equipment	(669)	(241)
Purchase of available-for-sale securities	(53,501)
Net cash used investing activities	(54,170)	(241)
Cash flows from financing activities:
Proceeds from business combination and private offering	560,777	0
Transaction costs related to business combination and private offering	(47,228)	0
Proceeds from exercise of stock options	198	5
Net cash provided by financing activities	513,747	5
Net increase (decrease) in cash and cash equivalents	444,781	(5,949)
Beginning cash and cash equivalents	24,624	46,637
Ending cash and cash equivalents	469,405	40,688
Supplemental disclosures of cash flow information:
Cash paid for interest
Cash paid for income taxes
Supplemental disclosures of non-cash investing and financing activities:
Changes in purchases of property and equipment recorded in accounts payable and accrued liabilities	215	19
Offering costs included in accounts payable and accrued liabilities	$ 534
Private placement of warrants acquired as part of merger	3,014
Right-of-use assets obtained in exchange for lease liability	$ 4,692
Non-cash lease adoption	$ 1,665