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Income Taxes (Detail Textuals) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]          
Income tax expense $ 191 $ 510 $ 356 $ 1,026  
Income tax U.S. statutory rate 34.00% 34.00% 34.00% 34.00%  
Tax benefits from stock-based awards     $ 600 $ 600  
Deferred tax assets $ 900   900    
Equity adjustment to additional paid-in capital     $ 600 $ 600  
Federal | Research and development credit carryforwards          
Operating Loss Carryforwards [Line Items]          
Net federal and state research and development credit carryforwards         $ 4,000
State | Research and development credit carryforwards          
Operating Loss Carryforwards [Line Items]          
Net federal and state research and development credit carryforwards         $ 300