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Commitments and Contingencies - Lease Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Nov. 30, 2017
Commitments and Contingencies Disclosure [Abstract]    
Leasehold improvements incentive   $ 794
Term of contract   6 years
Renewal term   5 years
Leasehold improvements financing   $ 316
Leasehold improvements financing interest rate   7.00%
Operating lease costs $ 217  
Operating lease liabilities $ 193  
Weighted average discount rate 6.50%  
Weighted average remaining lease term 5 years 7 months 6 days