CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands		Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balance (in shares) at Dec. 31, 2016			45,534
Balance at Dec. 31, 2016		$ 368,909	$ 455	$ 587,057	$ (220,799)	$ 2,196
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation (in shares)			303
Stock-based compensation		7,204	$ 4	7,200
Purchase of common stock for retirement (in shares)			(61)
Purchase of common stock for retirement		(963)	$ (1)	(962)
Other comprehensive loss		(52)				(52)
Net income (loss)		72,621			72,621
Balance (in shares) at Dec. 31, 2017			45,776
Balance at Dec. 31, 2017		447,719	$ 458	593,295	(148,178)	2,144
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with acquisition (in shares)			1,108
Issuance of common stock in connection with acquisition		19,318	$ 11	19,307
Share-based compensation (in shares)			147
Stock-based compensation		6,196	$ 1	6,195
Purchase of common stock for retirement (in shares)			(47)
Purchase of common stock for retirement		(860)		(860)
Other comprehensive loss		529				529
Net income (loss)		39,427			39,427
Balance (in shares) at Dec. 31, 2018			46,984
Balance at Dec. 31, 2018		512,329	$ 470	617,937	(108,751)	2,673
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with acquisition (in shares)			2,364
Issuance of common stock in connection with acquisition		36,980	$ 23	36,957
Issuance of common stock for convertible notes repurchase, net (in shares)	[1]		3,243
Issuance of common stock for convertible notes repurchase, net	[1]	45,617	$ 32	45,585
Issuance of common stock for employee stock purchase plan (in shares)			68
Issuance of common stock for employee stock purchase plan		1,490	$ 1	1,489
Share-based compensation (in shares)			202
Stock-based compensation		6,213	$ 3	6,210
Purchase of common stock for retirement (in shares)			(54)
Purchase of common stock for retirement		$ (1,276)		(1,276)
Exercise of stock options (in shares)		483	447
Exercise of stock options		$ 8,171	$ 4	8,167
Other comprehensive loss		(2,091)				(2,091)
Net income (loss)		40,809			40,809
Balance (in shares) at Dec. 31, 2019			53,254
Balance at Dec. 31, 2019		$ 648,242	$ 533	$ 715,069	$ (67,942)	$ 582

[1] The issuance of common stock for the repurchase of a portion of our 5.00% Convertible Senior Notes during the year ended December 31, 2019 is presented net of a $28.7 million write-off associated with the equity component of the repurchased notes.