CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2019		26,547
Beginning balance at Dec. 31, 2019	$ 143,267	$ 8	$ 480,578	$ 1,312	$ (338,631)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options (in shares)		161
Exercise of common stock options	3,145		3,145
Stock-based compensation	4,180		4,180
Settlement of restricted stock (in shares)		107
Other comprehensive loss	1,297			1,297
Net loss	(13,531)				(13,531)
Ending balance (in shares) at Mar. 31, 2020		26,824
Ending balance at Mar. 31, 2020	138,358	$ 8	487,903	2,609	(352,162)
Beginning balance (in shares) at Dec. 31, 2020		27,861
Beginning balance at Dec. 31, 2020	$ 157,192	$ 8	551,429	(192)	(394,053)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options (in shares)	31	31
Exercise of common stock options	$ 507		507
Stock-based compensation	7,394		7,394
Settlement of restricted stock (in shares)		28
Issuance of common stock (in shares)		3,850
Issuance of common stock	484,043		484,043
Common stock purchase consideration for the acquisition of Dosh	117,354		117,354
Fair value of assumed Dosh options attributable to pre-combination service	3,593		3,593
Other comprehensive loss	(296)			(296)
Net loss	(24,895)				(24,895)
Ending balance (in shares) at Mar. 31, 2021		31,770
Ending balance at Mar. 31, 2021	$ 744,892	$ 8	$ 1,164,320	$ (488)	$ (418,948)