CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	[1]	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	[1]
Beginning balance (in shares) at Dec. 31, 2018				27,347,115
Beginning balance, amount at Dec. 31, 2018	$ 89,638			$ 27	$ 271,550	$ (1,707)	$ (180,232)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and vesting of restricted stock units (in shares)				1,021,730
Exercise of stock options and vesting of restricted stock units	975			$ 1	974
Stock-based compensation expense	8,976				8,976
Statutory tax withholding related to net-share settlement of restricted stock units (in shares)				(291,376)
Statutory tax withholding related to net-share settlement of restricted stock units	(3,389)				(3,389)
Net income	3,482						3,482
Foreign currency translation adjustments	(33)					(33)
Ending balance (in shares) at Dec. 31, 2019				28,077,469
Ending balance, amount at Dec. 31, 2019	99,649			$ 28	278,111	(1,740)	(176,750)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and vesting of restricted stock units (in shares)				1,183,904
Exercise of stock options and vesting of restricted stock units	3,826			$ 1	3,825
Stock-based compensation expense	10,200				10,200
Statutory tax withholding related to net-share settlement of restricted stock units (in shares)				(240,949)
Statutory tax withholding related to net-share settlement of restricted stock units	(3,294)				(3,294)
Net income	18,825						18,825
Foreign currency translation adjustments	$ 645					645
Ending balance (in shares) at Dec. 31, 2020				29,020,424
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2016-13 [Member]
Ending balance, amount at Dec. 31, 2020	$ 130,091	$ 240		$ 29	288,842	(1,095)	(157,685)	$ 240
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and vesting of restricted stock units (in shares)				1,409,253
Exercise of stock options and vesting of restricted stock units	5,743			$ 1	5,742
Stock-based compensation expense	12,034				12,034
Statutory tax withholding related to net-share settlement of restricted stock units (in shares)				(241,082)
Statutory tax withholding related to net-share settlement of restricted stock units	(5,743)				(5,743)
Net income	47,215						47,215
Foreign currency translation adjustments	(1,142)					(1,142)
Ending balance (in shares) at Dec. 31, 2021				30,188,595
Ending balance, amount at Dec. 31, 2021	$ 188,198			$ 30	$ 300,875	$ (2,237)	$ (110,470)

[1] The Company recorded a reduction to accumulated deficit at January 1, 2020 as a result of its adoption of Accounting Standards Update No. 2016-13, Financial Instruments - Credit Losses (Topic 326).