CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total
BALANCE at Dec. 31, 2009	$ 103	$ 14,898	$ 0	$ 1,906	$ 0	$ 16,907
BALANCE (in shares) at Dec. 31, 2009	10,256,364
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	0	392	0	0	0	392
Net income (loss)	0	0		11,601	0	11,601
BALANCE at Dec. 31, 2010	103	15,290	0	13,507	0	28,900
BALANCE (in shares) at Dec. 31, 2010	10,256,364
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation related to stock options and restricted stock	0	7,774	0		0	7,774
Stock-based compensation - grants of common stock	20	13,843	0	0	0	13,863
Stock-based compensation - grant of common stock (in shares)	2,045,571
Exercise of stock options	28	382	0	0	0	410
Exercise of stock options (in shares)	2,783,303
Reverse merger acquisition	37	60,683	0	0	0	60,720
Reverse merger acquisition (in shares)	3,736,490
Purchase of Company Stock	0	0	(250)	0	0	(250)
Purchase of Company Stock (in shares)	0					16,056
Other comprehensive income	0	0	0	0	2	2
Net income (loss)	0	0	0	(694)	0	(694)
BALANCE at Dec. 31, 2011	188	97,972	(250)	12,813	2	110,725
BALANCE (in shares) at Dec. 31, 2011	18,821,728					18,821,728
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of warrants to consultants for services	0	98	0	0	0	98
Stock-based compensation related to stock options and restricted stock	0	5,709	0	0	0	5,709
Stock-based compensation - grants of common stock	0	405	0	0	0	405
Stock-based compensation - grant of common stock (in shares)	30,000
Exercise of stock options	0	67	0	0	0	67
Exercise of stock options (in shares)	10,048
Adjustments To Additional Paid In Capital, Stock Options Issued for Services	0	83	0	0	0	83
Issuance of common stock, net	30	37,484	0	0	0	37,514
Issuance of common stock, net (in shares)	3,023,432
Repurchase and retirement of common stock	(9)	(10,747)	0	0	0	(10,756)
Repurchase and retirement of common stock (in shares)	(842,961)
Warrants exercised	1	133	0	0	0	134
Warrants exercised (in shares)	17,756
Retirement of treasury stock	0	(250)	250	0	0	0
Retirement of treasury stock (in shares)	(16,056)
Other comprehensive income	0	0	0	0	859	859
Net income (loss)	0	0	0	22,489	0	22,489
BALANCE at Dec. 31, 2012	$ 210	$ 130,954	$ 0	$ 35,302	$ 861	$ 167,327
BALANCE (in shares) at Dec. 31, 2012	21,043,947					21,043,947