Condensed Consolidated Statements of Changes in 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		63,569,109
Beginning balance at Dec. 31, 2019	$ 711,250	$ 63	$ 1,197,379	$ (479,388)	$ (6,804)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock in connection with settlement of restricted stock units, net of withholdings (in shares)		96,683
Issuance of common stock in connection with settlement of restricted stock units, net of withholdings	0	$ 1	(1)
Exercise of stock options (in shares)		37,275
Exercise of stock options	384		384
Stock-based compensation expense	20,870		20,870
Net loss	(60,106)			(60,106)
Foreign currency translation adjustment	(16,115)				(16,115)
Ending balance (in shares) at Mar. 31, 2020		63,703,067
Ending balance at Mar. 31, 2020	$ 656,283	$ 64	1,218,632	(539,494)	(22,919)
Beginning balance (in shares) at Dec. 31, 2020	72,451,521	72,451,521
Beginning balance at Dec. 31, 2020	$ 940,990	$ 72	1,646,574	(695,872)	(9,784)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock in connection with settlement of restricted stock units, net of withholdings (in shares)		1,404,971
Issuance of common stock in connection with settlement of restricted stock units, net of withholdings	$ (12,613)	$ 2	(12,615)
Exercise of stock options (in shares)	181,716	181,716
Exercise of stock options	$ 3,533		3,533
Stock-based compensation expense	24,947		24,947
Net loss	(45,564)			(45,564)
Foreign currency translation adjustment	$ (805)				(805)
Ending balance (in shares) at Mar. 31, 2021	74,038,208	74,038,208
Ending balance at Mar. 31, 2021	$ 910,488	$ 74	$ 1,662,439	$ (741,436)	$ (10,589)