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Term Loan - Future Principal Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term Debt $ 0 $ 19,802
Debt Financing Agreement Tranche A    
Debt Instrument [Line Items]    
Future Repayments of Principal, 2018 5,000  
Future Repayments of Principal, 2019 10,000  
Future Repayments of Principal, 2020 5,000  
Long-term Debt $ 20,000