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Commitments and Contingencies - Operating, Finance, and Capital Lease Arrangements (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating lease ROU assets $ 2,493  
Operating lease ROU accumulated amortization (407)  
Operating lease liabilities 2,290  
Finance lease ROU assets 1,925  
Finance lease ROU accumulated amortization (195)  
Finance lease liabilities $ 1,310  
Capital lease assets   $ 2,097
Capital lease accumulated amortization   (104)
Capital lease liabilities   $ 1,789