Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive income (loss)
Beginning balance (in shares) at Dec. 31, 2019		61,635,477
Beginning balance at Dec. 31, 2019	$ 352,485	$ 7	$ 686,390	$ (334,170)	$ 258
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock (in shares)		404,637
Exercise of stock option (in shares)		4,309
Exercise of stock options	15		15
Stock-based compensation	8,244		8,244
Issuance of common stock pursuant to Employee Stock Purchase Plan (in shares)		49,889
Issuance of common stock pursuant to Employee Stock Purchase Plan	556		556
Net loss	(54,074)			(54,074)
Other comprehensive loss	(763)				(763)
Ending balance (in shares) at Mar. 31, 2020		62,094,312
Ending balance at Mar. 31, 2020	306,463	$ 7	695,205	(388,244)	(505)
Beginning balance (in shares) at Dec. 31, 2020		73,874,904
Beginning balance at Dec. 31, 2020	$ 320,684	$ 8	897,607	(577,530)	599
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock (in shares)		238,962
Exercise of stock option (in shares)	5,721	5,721
Exercise of stock options	$ 15		15
Stock-based compensation	8,708		8,708
Issuance of common stock pursuant to Employee Stock Purchase Plan (in shares)		95,004
Issuance of common stock pursuant to Employee Stock Purchase Plan	759		759
Issuance of common stock for restricted stock units vested (in shares)		278,559
Net loss	(57,641)			(57,641)
Other comprehensive loss	(441)				(441)
Ending balance (in shares) at Mar. 31, 2021		74,493,150
Ending balance at Mar. 31, 2021	$ 272,084	$ 8	$ 907,089	$ (635,171)	$ 158