Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Components of lease expense (Details)

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Commitments and Contingencies - Components of lease expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Operating lease costs:        
Operating lease rental expense $ 310   $ 886  
Sublease income (358)   (987)  
Total operating lease costs (48)   (101)  
Finance lease costs:        
Amortization of right-of-use assets 2   8  
Interest on lease liabilities     1  
Total finance lease costs $ 2   $ 9  
Operating lease costs:        
Operating lease rental expense   $ 213   $ 1,011
Total operating lease costs   213   1,011
Finance lease costs:        
Amortization of right-of-use assets   3   9
Interest on lease liabilities       2
Total finance lease costs   $ 3   $ 11