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Commitments and Contingencies - Components of Lease Expense (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Operating lease cost $ 421
Finance lease cost:  
Amortization of right-of-use assets 313
Interest on lease liabilities 90
Total finance lease cost 403
Short-term lease cost 73
Variable lease cost 66
Total Lease Cost $ 963