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Leases - Lease costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Leases [Abstract]        
Fixed lease cost $ 1,431 $ 3,078    
Variable lease cost 184 488    
Short-term lease cost 94 235    
Total operating lease cost 1,709 3,801    
Assets and Liabilities, Lessee [Abstract]        
Operating lease ROU asset 13,708 13,708   $ 11,300
Operating lease liabilities- current 4,605 4,605    
Operating lease liabilities- noncurrent 9,455 9,455    
Total operating lease liability $ 14,060 $ 14,060    
Weighted-average remaining lease terms - operating leases (years) 3 years 6 months 29 days 3 years 6 months 29 days    
Weighted-average discount rate - operating leases ( as a percent) 7.05% 7.05%    
Operating cash flows from operating leases   $ 2,751    
Right-of-use assets obtained in exchange for lease obligations   $ 16,120 $ 0