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, 2012	$ 9		$ 306,252	$ (280,496)	$ 25,765
Beginning balance (shares) at Dec. 31, 2012	8,855,400
Share-based compensation, amount			705		705
Issuance of common stock upon exercise of stock options, amount			214		$ 214
Issuance of common stock upon exercise of stock options (shares)	54,337				54,337
Net income				38,144	$ 38,144
Ending balance, amount at Dec. 31, 2013	$ 9		307,171	(242,352)	64,828
Ending balance (shares) at Dec. 31, 2013	8,909,737
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		308,190	(238,941)	$ 69,258
Ending balance (shares) at Dec. 31, 2014	8,880,377				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			21,133		$ 21,133
Issuance of preferred shares, (shares)		168,007
Issuance of restricted shares, amount
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		$ 342,485	$ (234,295)	$ 108,201
Ending balance (shares) at Dec. 31, 2015	10,626,624	168,007			10,626,624