Consolidated Statements of Stockholders' Equity - 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, 2018		36,705
Beginning balance at Dec. 31, 2018	$ 217,783	$ 15	$ 324,656	$ (2,157)	$ (104,731)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(1,235)				(1,235)
Issuance of common stock pursuant to exercise of stock options (in shares)		201
Issuance of common stock pursuant to exercise of stock options	466		466
Stock-based compensation	1,909		1,909
Cumulative translation adjustment	(260)			(260)
Ending balance (in shares) at Mar. 31, 2019		36,906
Ending balance at Mar. 31, 2019	$ 218,663	$ 15	326,870	(2,417)	(105,805)
Beginning balance (in shares) at Dec. 31, 2019	38,084	38,084
Beginning balance at Dec. 31, 2019	$ 216,608	$ 15	336,732	(2,685)	(117,454)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (7,475)				(7,475)
Issuance of common stock pursuant to exercise of stock options (in shares)	373	373
Issuance of common stock pursuant to exercise of stock options	$ 558		558
Issuance of common stock pursuant to vesting of restricted stock awards and units, net of stock withheld for tax (in shares)		16
Issuance of common stock pursuant to vesting of restricted stock awards and units, net of stock withheld for tax	(11)		(11)
Stock-based compensation	3,763		3,763
Cumulative translation adjustment	$ (496)			(496)
Ending balance (in shares) at Mar. 31, 2020	38,473	38,473
Ending balance at Mar. 31, 2020	$ 212,947	$ 15	$ 341,042	$ (3,181)	$ (124,929)