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, 2015		15,746,288
Beginning balance at Dec. 31, 2015	$ 60,270	$ 2	$ 112,447	$ (3,289)	$ (48,890)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in business combination (in shares)		1,344,463
Issuance of common stock in business combination	8,300		8,300
Issuance of stock under Company plans, net of shares withheld for tax (in shares)		694,537
Issuance of stock under Company plans, net of shares withheld for tax	(514)		(514)
Stock-based compensation	4,333		4,333
Other comprehensive loss	137			137
Net loss	$ (13,513)				(13,513)
Ending balance (in shares) at Dec. 31, 2016	17,785,288	17,785,288
Ending balance at Dec. 31, 2016	$ 59,013	$ 2	124,566	(3,152)	(62,403)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in business combination	0
Issuance of stock under Company plans, net of shares withheld for tax (in shares)		843,579
Issuance of stock under Company plans, net of shares withheld for tax	(2,163)		(2,163)
Issuance of stock, net of issuance costs (in shares)		2,139,534
Issuance of stock, net of issuance costs	42,564		42,564
Stock-based compensation	9,977		9,977
Other comprehensive loss	749			749
Net loss	$ (18,725)				(18,725)
Ending balance (in shares) at Dec. 31, 2017	20,768,401	20,768,401
Ending balance at Dec. 31, 2017	$ 91,415	$ 2	$ 174,944	$ (2,403)	$ (81,128)