CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Preferred Stock	Additional Paid-In Capital	Accumulated Deficit	Total
Beginning balance, amount at Dec. 31, 2013	$ 9	$ 0	$ 307,171	$ (242,352)	$ 64,828
Beginning balance (shares) at Dec. 31, 2013	8,909,737	0
Share-based compensation, amount			1,426		1,426
Issuance of common stock upon exercise of stock options, amount	$ 0		562		$ 562
Issuance of common stock upon exercise of stock options (shares)	134,668				134,668
Issuance of warrants, amount			510		$ 510
Premium on convertible note, amount			300		300
Repurchase of common stock, amount	$ 0		(1,779)		(1,779)
Repurchase of common stock (shares)	(164,028)
Net income				3,411	3,411
Ending balance, amount at Dec. 31, 2014	$ 9	$ 0	308,190	(238,941)	$ 69,258
Ending balance (shares) at Dec. 31, 2014	8,880,377	0			8,880,377
Share-based compensation, amount			2,563		$ 2,563
Issuance of common stock upon exercise of stock options, amount			1,197		$ 1,197
Issuance of common stock upon exercise of stock options (shares)	145,979				145,979
Issuance of warrants, amount			2,542		$ 2,542
Issuance of preferred shares, amount		$ 0	21,133		21,133
Issuance of preferred shares, (shares)		168,007
Issuance of restricted shares, (shares)	125,000
Exercise of warrants, amount	$ 400,000		1,860		1,861
Exercise of warrants (shares)	1
Conversion of note payable, amount	$ 1,075,268		5,000		5,001
Conversion of note payable, shares	1
Net income				4,646	4,646
Ending balance, amount at Dec. 31, 2015	$ 11	$ 0	342,485	(234,295)	$ 108,201
Ending balance (shares) at Dec. 31, 2015	10,626,624	168,007			10,626,624
Share-based compensation, amount			4,486		$ 4,486
Issuance of common stock upon exercise of stock options, amount	$ 0		3,051		$ 3,051
Issuance of common stock upon exercise of stock options (shares)	386,001				386,001
Net income				3,871	$ 3,871
Ending balance, amount at Dec. 31, 2016	$ 11	$ 0	$ 350,022	$ (230,424)	$ 119,609
Ending balance (shares) at Dec. 31, 2016	11,012,625	168,007			11,012,625