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Leases - Lease costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Leases [Abstract]        
Fixed lease cost $ 835 $ 1,647    
Variable lease cost 161 304    
Short-term lease cost 88 141    
Total operating lease cost 1,084 2,092    
Assets and Liabilities, Lessee [Abstract]        
Operating lease ROU asset 10,387 10,387   $ 11,300
Operating lease liabilities- current 2,143 2,143    
Operating lease liabilities- noncurrent 8,416 8,416    
Total operating lease liability $ 10,559 $ 10,559    
Weighted-average remaining lease terms - operating leases (years) 4 years 6 months 3 days 4 years 6 months 3 days    
Weighted-average discount rate - operating leases ( as a percent) 7.18% 7.18%    
Operating cash flows from operating leases   $ 1,508    
Right-of-use assets obtained in exchange for lease obligations   $ 11,643 $ 0