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Leases - Components of lease expense and other supplementary information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Components of lease expense:      
Operating lease cost $ 523    
Short term lease cost 76    
Sublease income (102)    
Total lease cost 497    
Supplemental cash flow information [Abstract]      
Operating cash flows from operating leases 702    
Right-of-use assets obtained in exchange for lease obligations, operating leases 0    
Supplemental balance sheet information [Abstract]      
Operating lease right-of use assets 9,106 $ 9,400 $ 0
Current portion, operating lease liabilities 2,297   0
Operating lease liabilities, long term 9,062   $ 0
Operating lease liabilities $ 11,359 $ 11,700  
Weighted average remaining lease term 8 years 7 months 6 days    
Weighted average discount rate 9.20%