CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY - USD ($) $ in Thousands	Total	Common Stock and Additional Paid-In Capital	Accumulated Other Comprehensive Income	Accumulated Deficit	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2018		37,652,498			6,823,147
Beginning balance at Dec. 31, 2018	$ 99,660	$ 246,415	$ 116	$ (98,521)	$ (48,350)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(11,016)			(11,016)
Unrealized gain (loss) on available-for-sale securities, net of taxes	6		6
Issuance of common stock for employee stock purchase (in shares)		13,479
Issuance of common stock for employee stock purchase	109	$ 109
Exercise of stock options, net of shares withheld for employee taxes (in shares)		11,771
Exercise of stock options, net of shares withheld for employee taxes	71	$ 71
Release of restricted stock units and awards (in shares)		697,996
Release of restricted stock units and awards	0
Stock based compensation	2,103	$ 2,103
Ending balance (in shares) at Mar. 31, 2019		38,375,744			6,823,147
Ending balance at Mar. 31, 2019	90,933	$ 248,698	122	(109,537)	$ (48,350)
Beginning balance (in shares) at Dec. 31, 2019		38,624,784			7,210,456
Beginning balance at Dec. 31, 2019	83,757	$ 253,289	124	(118,565)	$ (51,091)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(4,828)
Unrealized gain (loss) on available-for-sale securities, net of taxes	(2)		(2)
Repurchased shares (in shares)					2,012,766
Repurchase of stock	(11,975)				$ (11,975)
Issuance of common stock for employee stock purchase (in shares)		10,162
Issuance of common stock for employee stock purchase	63	$ 63
Release of restricted stock units and awards (in shares)		189,735
Release of restricted stock units and awards	0
Stock based compensation	729	$ 729
Ending balance (in shares) at Mar. 31, 2020		38,824,681			9,223,222
Ending balance at Mar. 31, 2020	$ 67,744	$ 254,081	$ 122	$ (123,393)	$ (63,066)