Condensed Consolidated Statements of Stockholders’ Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional paid-in capital	Treasury stock	Accumulated other comprehensive income (loss)	Accumulated deficit	Total
Beginning balance at Dec. 31, 2018	$ 3	$ 554,403	$ (35,706)	$ (52)	$ (451,961)	$ 66,687
Beginning balance (in shares) at Dec. 31, 2018	25,483
Issuance of stock under employee stock awards and other, net		270				270
Issuance of stock under employee stock awards and other, net (in shares)	319
Tax withholdings related to vesting of share-based payments		(1,322)				(1,322)
Stock-based compensation expense		2,045				2,045
Foreign currency translation adjustment				27		27
Net loss					(10,286)	(10,286)
Ending balance at Mar. 31, 2019	$ 3	555,396	(35,706)	(25)	(462,247)	57,421
Ending balance (in shares) at Mar. 31, 2019	25,802
Beginning balance at Dec. 31, 2019	$ 3	562,332	(35,706)	(20)	(478,799)	$ 47,810
Beginning balance (in shares) at Dec. 31, 2019	26,283					26,283
Issuance of stock under employee stock awards and other, net		6				$ 6
Issuance of stock under employee stock awards and other, net (in shares)	320
Tax withholdings related to vesting of share-based payments		(556)				(556)
Stock-based compensation expense		2,833				2,833
Foreign currency translation adjustment				(62)		(62)
Net loss					(10,676)	(10,676)
Ending balance at Mar. 31, 2020	$ 3	$ 564,615	$ (35,706)	$ (82)	$ (489,475)	$ 39,355
Ending balance (in shares) at Mar. 31, 2020	26,603					26,603