CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Earnings/(Deficit)
Balance at Dec. 31, 2016	$ 168,764	$ 338	$ 242,036	$ (13,749)	$ (59,861)
Balance (in shares) at Dec. 31, 2016		33,844,074
Net income	28,353				28,353
Exercise of stock options and releases of restricted stock	2,351	$ 3	2,348
Exercise of stock options and releases of restricted stock (in shares)		330,185
Issuance of commons stock pursuant to the acquisition	247,575	$ 62	247,513
Issuance of commons stock pursuant to the acquisition, (in shares)		6,153,995
Unrealized gain on investments	5			5
Payment of contingent consideration in stock	1,063	$ 1	1,062
Payment of contingent consideration in stock (in shares)		30,756
Proceeds from issuance of common stock, net of issuance costs	129,309	$ 32	129,277
Proceeds from issuance of common stock, net of issuance costs (in shares)		3,228,069
Stock-based compensation expense	6,747		6,747
Balance at Dec. 31, 2017	591,548	$ 436	628,983	(6,363)	(31,508)
Balance (in shares) at Dec. 31, 2017		43,587,079
Translation adjustment	7,381			7,381
Net income	16,617				16,617
Issuance of common stock for debt conversion	0	$ 0	0
Issuance of common stock for debt conversion (in shares)		2
Exercise of stock options and releases of restricted stock	3,418	$ 3	3,415
Exercise of stock options and releases of restricted stock (in shares)		330,297
Stock-based compensation expense	10,192		10,192
Balance at Dec. 31, 2018	615,568	$ 439	642,590	(11,893)	(15,568)
Balance (in shares) at Dec. 31, 2018		43,917,378
Cumulative effect of accounting changes	(677)				(677)
Translation adjustment	(5,530)			(5,530)
Net income	21,411				21,411
Issuance of common stock for debt conversion	198,757	$ 23	198,734
Issuance of common stock for debt conversion (in shares)		2,316,229
Reduction of equity component from debt conversion, net of tax	(200,079)		(200,079)
Exercise of stock options and releases of restricted stock	1,167	$ 3	1,164
Exercise of stock options and releases of restricted stock (in shares)		339,329
Issuance of commons stock pursuant to the acquisition	53,938	$ 8	53,930
Issuance of commons stock pursuant to the acquisition, (in shares)		779,221
Tax withholding on vesting of restricted stock units	(490)	$ 0	(490)
Tax withholding on vesting of restricted stock units (in shares)		(5,430)
Equity component of 0.375% senior convertible notes, net of tax	39,070		39,070
Proceeds from issuance of common stock, net of issuance costs	320,713	$ 48	320,665
Proceeds from issuance of common stock, net of issuance costs (in shares)		4,731,531
Stock-based compensation expense	12,847		12,847
Balance at Dec. 31, 2019	1,059,768	$ 521	$ 1,068,431	(15,027)	$ 5,843
Balance (in shares) at Dec. 31, 2019		52,078,258
Translation adjustment	$ (3,134)			$ (3,134)