Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital (APIC)	Accumulated Deficit	Accumulated other comprehensive (loss) income, net of tax
Beginning Balance (in shares) at Dec. 31, 2015		39,941,000
Beginning Balance at Dec. 31, 2015	$ 251,282	$ 40	$ 327,045	$ (75,803)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(26,241)			(26,241)
Warrant exercise (in shares)		821,000
Warrant exercise, net	$ 1,920	$ 1	1,919
Option exercise (in shares)	82,550	82,000
Option exercise, net	$ 537	$ 0	537
Equity issued as part of acquisitions (in shares)		129,000
Equity issued as part of acquisitions, net	1,130		1,130
Shares withheld for tax withholding on vesting of restricted stock (in shares)		(20,000)
Shares withheld for tax withholding on vesting of restricted stock	(220)		(220)
Stock based compensation (in shares)		24,000
Share-based compensation	3,472		3,472
Ending Balance (in shares) at Dec. 31, 2016		40,977,000
Ending Balance at Dec. 31, 2016	231,880	$ 41	333,883	(102,044)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(13,389)			(13,389)
Warrant exercise (in shares)		14,000
Warrant exercise, net	$ 0	$ 0	0
Option exercise (in shares)	34,862	35,000
Option exercise, net	$ 222	$ 0	222
Shares withheld for tax withholding on vesting of restricted stock (in shares)		(2,000)
Shares withheld for tax withholding on vesting of restricted stock	(9)		(9)
Stock issued in secondary offering, net of expenses (in shares)		8,500,000
Stock issued in secondary offering, net of expenses	84,586	$ 9	84,577
Stock based compensation (in shares)		352,000
Share-based compensation	4,228		4,228
Ending Balance (in shares) at Dec. 31, 2017		49,876,000
Ending Balance at Dec. 31, 2017	307,518	$ 50	422,901	(115,433)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adopting ASC 606	(996)			(996)
Net loss	(22,280)			(22,280)
Other comprehensive income, net of tax	$ (1,320)				(1,320)
Option exercise (in shares)	75,836	76,000
Option exercise, net	$ 395		395
Shares withheld for tax withholding on vesting of restricted stock (in shares)		(11,000)
Shares withheld for tax withholding on vesting of restricted stock	(113)		(113)
Stock based compensation (in shares)		55,000
Share-based compensation	4,908		4,908
Settlement of capped call transactions	2,118		2,118
Ending Balance (in shares) at Dec. 31, 2018		49,996,000
Ending Balance at Dec. 31, 2018	$ 290,230	$ 50	$ 430,209	$ (138,709)	$ (1,320)