Consolidated Statements of Shareholders' Equity (unaudited) (USD $) In Thousands, except Share data	Total	Common stock [Member]	Subscription Receivable [Member]	Additional paid-in capital [Member]	Deficit accumulated [Member]
Beginning balance at Dec. 31, 2012	$ 38,331	$ 26	$ (2,004)	$ 112,384	$ (72,075)
Beginning balance, shares at Dec. 31, 2012	26,235,998	26,229,909
Stock-based compensation expense	209			209
Warrants exercised	38			38
Warrants exercised, shares		6,089
Subscription received	4		4
Net loss	(12,044)				(12,044)
Ending balance at Jun. 30, 2013	$ 26,538	$ 26	$ (2,000)	$ 112,631	$ (84,119)
Ending balance, shares at Jun. 30, 2013	26,235,998	26,235,998