CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Common 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
Repurchase of common stock (shares)
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			8,909,737
Share-based compensation, amount		1,426		1,426
Issuance of common stock upon exercise of stock options, amount		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		(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	880,377			8,880,377