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Leases - Components of lease expense and other supplementary information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Components of lease expense:        
Operating lease cost $ 523 $ 1,561    
Short term lease cost 29 156    
Sublease income (104) (309)    
Total lease cost 448 1,408    
Supplemental cash flow information [Abstract]        
Operating cash flows from operating leases 1,815      
Right-of-use assets obtained in exchange for lease obligations, operating leases 0      
Supplemental balance sheet information [Abstract]        
Operating lease right-of use assets 8,497 8,497 $ 9,400 $ 0
Current portion, operating lease liabilities 2,424 2,424   0
Operating lease liabilities, long term 8,342 8,342   $ 0
Operating lease liabilities $ 10,766 $ 10,766 $ 11,700  
Weighted average remaining lease term 8 years 4 months 24 days 8 years 4 months 24 days    
Weighted average discount rate 9.20% 9.20%