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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Tax Credit Carryforward [Line Items]    
Operating loss and tax credit carryforwards limitations on use minimum change in ownership percentage 50.00%  
Maximum indefinite lived deferred tax liability as percentage of net operating loss 8000.00%  
Valuation allowance, deferred tax asset, increase (decrease), amount $ 1,400  
Impact on tax provision from unrecognized tax benefits 55 $ 72
Domestic Tax Authority    
Tax Credit Carryforward [Line Items]    
Operating loss carryforwards 19,700  
State and Local Jurisdiction    
Tax Credit Carryforward [Line Items]    
Operating loss carryforwards 3,700  
Research Tax Credit Carryforward | Domestic Tax Authority    
Tax Credit Carryforward [Line Items]    
Tax credit carryforwards, research $ 100