Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2017		20,768,401
Beginning balance at Dec. 31, 2017	$ 91,415	$ 2	$ 174,944	$ (2,403)	$ (81,128)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under Company plans, net of shares withheld for tax (in shares)		758,025
Issuance of stock under Company plans, net of shares withheld for tax	(561)		(561)
Issuance of stock, net of issuance costs	(21)		(21)
Stock-based compensation	2,577		2,577
Foreign currency translation adjustment	(453)			(453)
Net loss	(3,161)				(3,161)
Ending balance (in shares) at Mar. 31, 2018		21,526,426
Ending balance at Mar. 31, 2018	$ 96,088	$ 2	176,939	(2,856)	(77,997)
Beginning balance (in shares) at Dec. 31, 2018	21,489,112	21,489,112
Beginning balance at Dec. 31, 2018	$ 87,307	$ 2	180,481	(7,501)	(85,675)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in business combination (in shares)		3,651
Issuance of common stock in business combination	(30)		(30)
Issuance of stock under Company plans, net of shares withheld for tax (in shares)		(49,537)
Issuance of stock under Company plans, net of shares withheld for tax	(1,379)		(1,379)
Stock-based compensation	4,628		4,628
Foreign currency translation adjustment	2,369			2,369
Net loss	$ (7,830)				(7,830)
Ending balance (in shares) at Mar. 31, 2019	21,443,226	21,443,226
Ending balance at Mar. 31, 2019	$ 85,065	$ 2	$ 183,700	$ (5,132)	$ (93,505)