Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Reconciled of provision for income taxes
Income tax benefit at statutory federal rate	$ (6,098)	$ (2,708)
State tax expense (benefit), net of federal	0	(445)
Research and development credits	126	0
Fair Value of Derivative	0	(1,221)
Expired tax attributes	0	3,008
Removal of net operating losses and research and development credits	0	(2,522)
Change in valuation allowance	5,972	10,037
Other	0	(6,149)
Provision for income taxes	$ 0	$ 0