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Leases - Components of lease expense and other supplementary information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Components of lease expense:        
Operating lease cost $ 515 $ 1,038    
Short term lease cost 51 127    
Sublease income (103) (205)    
Total lease cost 463 960    
Supplemental cash flow information [Abstract]        
Operating cash flows from operating leases 1,367      
Right-of-use assets obtained in exchange for lease obligations, operating leases 0      
Supplemental balance sheet information [Abstract]        
Operating lease right-of use assets 8,846 8,846 $ 9,400 $ 0
Current portion, operating lease liabilities 2,295 2,295   0
Operating lease liabilities, long term 8,714 8,714   $ 0
Operating lease liabilities $ 11,009 $ 11,009 $ 11,700  
Weighted average remaining lease term 8 years 6 months 8 years 6 months    
Weighted average discount rate 9.20% 9.20%