CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit	Total
Balance at beginning of period at Dec. 31, 2018	$ 2	$ (3,825)	$ 209,330	$ (66,498)	$ 139,009
Balance at beginning of period (in shares) at Dec. 31, 2018	20,719,297	(161,760)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock in connection with acquisition			9,504		9,504
Issuance of common stock in connection with acquisition (in shares)	149,053
Issuance of common stock awards (in shares)	9,547
Issuance of restricted stock (in shares)	565,840
Exercise of stock options		$ (40)	1,077		1,037
Exercise of stock options (in shares)	82,686	(690)
Issuance of common stock in connection with the settlement of acquisition-related contingent consideration			(609)		(609)
Issuance of common stock in connection with the settlement of acquisition-related contingent consideration (in shares)	614,225
Conversion feature of convertible senior subordinated notes, net of allocated debt issuance costs, net of tax effect			74,049		74,049
Purchase of convertible note hedges			(101,660)		(101,660)
Sale of warrants in connection with convertible senior subordinated notes			65,910		65,910
Stock-based compensation expense			6,852		6,852
Net loss				(10,979)	(10,979)
Balance at end of period at Mar. 31, 2019	$ 2	$ (3,865)	264,453	(77,477)	183,113
Balance at end of period (in shares) at Mar. 31, 2019	22,140,648	(162,450)
Balance at beginning of period at Dec. 31, 2019	$ 2	$ (3,865)	288,345	(98,934)	185,548
Balance at beginning of period (in shares) at Dec. 31, 2019	22,496,999	(175,689)
Increase (Decrease) in Stockholders' Equity
Issuance of common stock awards (in shares)	14,386
Issuance of restricted stock (in shares)	388,108
Forfeitures of restricted shares (in shares)		(33,371)
Exercise of stock options		$ (91)	1,244		1,153
Exercise of stock options (in shares)	116,288	(1,681)
Share adjustment		12,500
Stock-based compensation expense			7,137		7,137
Net loss				(14,437)	(14,437)
Balance at end of period at Mar. 31, 2020	$ 2	$ (3,956)	$ 296,726	$ (113,371)	$ 179,401
Balance at end of period (in shares) at Mar. 31, 2020	23,015,781	(198,241)