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Income Taxes (Detail Textuals) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]          
Income tax expense (benefit) $ 710 $ 191 $ 1,022 $ 356  
U.S. statutory tax rate     34.00% 34.00%  
Tax benefits from stock-based awards     $ 500 $ 600  
Deferred tax assets $ 1,000   1,000    
Equity adjustment to additional paid-in capital     $ 500 $ 600  
Federal | Research and development credit carryforwards          
Operating Loss Carryforwards [Line Items]          
Net federal and state research and development credit carryforwards         $ 5,500
State | Research and development credit carryforwards          
Operating Loss Carryforwards [Line Items]          
Net federal and state research and development credit carryforwards         $ 100