CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock and Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2018		37,652,498			6,823,147
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2018	$ 99,660	$ 246,415	$ 116	$ (98,521)	$ (48,350)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(20,044)			(20,044)
Unrealized loss on available-for-sale securities, net of taxes	8		8
Stock repurchase (in shares)					387,309
Stock repurchases	(2,741)				$ (2,741)
Exercise of stock options, net of shares withheld for employee taxes (in shares)		173,993
Exercise of stock options	1,245	$ 1,245
Release of restricted stock units and awards (in shares)		776,552
Release of restricted stock units and awards	0
Issuance of stock for ESPP purchase (in shares)		21,741
Issuance of stock for ESPP purchase	165	$ 165
Stock based compensation	5,464	$ 5,464
Ending balance (in shares) at Dec. 31, 2019		38,624,784			7,210,456
Ending balance at Dec. 31, 2019	83,757	$ 253,289	124	(118,565)	$ (51,091)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	5,401			5,401
Unrealized loss on available-for-sale securities, net of taxes	$ (2)		(2)
Stock repurchase (in shares)	4,900,000				4,932,977
Stock repurchases	$ (30,642)				$ (30,642)
Exercise of stock options, net of shares withheld for employee taxes (in shares)		75,675
Exercise of stock options	577	$ 577
Release of restricted stock units and awards (in shares)		438,199
Release of restricted stock units and awards	0
Issuance of stock for ESPP purchase (in shares)		22,556
Issuance of stock for ESPP purchase	134	$ 134
Stock based compensation	4,756	$ 4,756
Ending balance (in shares) at Dec. 31, 2020		39,161,214			12,143,433
Ending balance at Dec. 31, 2020	$ 63,981	$ 258,756	$ 122	$ (113,164)	$ (81,733)