CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	IPO	Private placement	Common Stock	Common Stock IPO	Common Stock Private placement	Additional Paid‑In Capital	Additional Paid‑In Capital IPO	Additional Paid‑In Capital Private placement	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018				102,649,701
Beginning balance at Dec. 31, 2018	$ 531,683			$ 103			$ 565,372			$ 0	$ (33,792)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)				168,391
Exercise of stock options	923			$ 0			923
Vesting of restricted stock units (in shares)				25,520
Share‑based compensation	2,461						2,461
Foreign currency translation adjustments	0
Net loss	(34,345)										(34,345)
Ending balance (in shares) at Dec. 31, 2019				102,843,612
Ending balance at Dec. 31, 2019	500,722			$ 103			568,756			0	(68,137)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)				526,460
Exercise of stock options	2,985						2,985
Issuance of common stock (in shares)					13,500,000	85,880
Issuance of common stock		$ 322,413	$ 2,233		$ 14			$ 322,399	$ 2,233
Vesting of restricted stock units (in shares)				36,520
Share‑based compensation	6,743						6,743
Foreign currency translation adjustments	0
Net loss	(24,082)										(24,082)
Ending balance (in shares) at Dec. 31, 2020				116,992,472
Ending balance at Dec. 31, 2020	811,014			$ 117			903,116			0	(92,219)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)				1,903,560
Exercise of stock options	10,691			$ 1			10,690
Vesting of restricted stock units (in shares)				530,032
Vesting of restricted stock units	1			$ 1
Share‑based compensation	35,805						35,805
Purchase of capped calls	(36,030)						(36,030)
Foreign currency translation adjustments	(7,866)									(7,866)
Net loss	(75,189)										(75,189)
Ending balance (in shares) at Dec. 31, 2021				119,426,064
Ending balance at Dec. 31, 2021	$ 738,426			$ 119			$ 913,581			$ (7,866)	$ (167,408)