CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY - USD ($) $ in Thousands		Total	Common Stock and Additional Paid-In Capital	Accumulated deficit	Accumulated Other Comprehensive Income (Loss)
Balance, beginning of period at Dec. 31, 2018			$ 353,336	$ (346,302)	$ 742
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment to additional paid in capital and other	[1]		26	(26)
Issuance of common stock from exercise of equity awards			1,664
Payment of withholding taxes related to net share settlement of equity awards			(1,355)
Stock-based compensation expense and other			3,353
Net income		$ 2,765		2,765
Foreign currency translation adjustments		(79)			(79)
Balance, end of period at Mar. 31, 2019		14,124	357,024	(343,563)	663
Balance, beginning of period at Dec. 31, 2019		272,212	458,316	(185,181)	(923)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment to additional paid in capital and other	[1]		0	0
Issuance of common stock from exercise of equity awards			1,979
Payment of withholding taxes related to net share settlement of equity awards			(34,267)
Stock-based compensation expense and other			7,515
Net income		68,936		68,936
Foreign currency translation adjustments		(168)			(168)
Balance, end of period at Mar. 31, 2020		$ 316,207	$ 433,543	$ (116,245)	$ (1,091)

[1] ncludes the adoption of Accounting Standards Update (“ASU”) 2018-07, “Compensation - Stock Compensation: Improvements to Non-employee Share-Based Payment Accounting” on January 1, 2019