Restatement of Previously Issued Consolidated Financial Statements - Consolidated statement of cash flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss	$ (54,032)	$ (103,319)
Adjustments to reconcile net loss to net cash used in operating activities
Loss on remeasurement of private warrant liability	(2,427)
Stock-based compensation	11,296	35,972
Other	7	236
Change in operating assets and liabilities, net of acquisitions and divestitures
Accounts receivable	203	(1,840)
Prepaid expenses and other current assets	(2,587)	603
Accounts payable	4,092	2,361
Accrued expenses and other current liabilities	(15,946)	7,704
Deferred revenue	2,206	(803)
Other	2,419	(975)
Net cash used in operating activities	(48,669)	(29,335)
Net cash used in investing activities	(10,671)	(5,208)
Net cash provided by financing activities	259,614	34,486
Change in cash, cash equivalents, and restricted cash	200,274	(57)
Cash, cash equivalents, and restricted cash, beginning of period	7,179	7,236
Cash, cash equivalents, and restricted cash end of period	207,453	7,179
As Filed
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss	(51,609)
Adjustments to reconcile net loss to net cash used in operating activities
Stock-based compensation	11,409
Other	(200)
Change in operating assets and liabilities, net of acquisitions and divestitures
Accounts receivable	16
Prepaid expenses and other current assets	(2,398)
Accounts payable	3,793
Accrued expenses and other current liabilities	(15,860)
Deferred revenue	1,868
Other	(1,788)
Net cash used in operating activities	(48,669)
Net cash used in investing activities	(10,671)
Net cash provided by financing activities	259,614
Change in cash, cash equivalents, and restricted cash	200,274
Cash, cash equivalents, and restricted cash, beginning of period	7,179
Cash, cash equivalents, and restricted cash end of period	207,453	$ 7,179
Restatement Adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss	(2,423)
Adjustments to reconcile net loss to net cash used in operating activities
Loss on remeasurement of private warrant liability	(2,427)
Stock-based compensation	(113)
Other	207
Change in operating assets and liabilities, net of acquisitions and divestitures
Accounts receivable	187
Prepaid expenses and other current assets	(189)
Accounts payable	299
Accrued expenses and other current liabilities	(86)
Deferred revenue	338
Other	$ 4,207