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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Income tax benefit attributable to our loss from operations    
U.S. federal income tax benefit at statutory rates $ (1,512) $ (1,877)
State income tax benefit, net of federal benefit (130) (161)
Research and experimentation credits (687,000) (71)
Settlement of liabilities assumed in the Merger      
Adjustment in tax basis of tangible and intangible assets acquired in the Merger      
Other 196 154
Change in valuation allowance 1,446 1,955
Total