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Leases - Lease costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Leases [Abstract]        
Fixed lease cost $ 4,929      
Variable lease cost 694      
Short-term lease cost 350      
Total operating lease cost 5,973      
Assets and Liabilities, Lessee [Abstract]        
Operating lease ROU asset 13,693     $ 11,300
Operating lease liabilities- current 5,153      
Operating lease liabilities- noncurrent 9,018      
Total operating lease liability $ 14,171     $ 11,300
Weighted-average remaining lease terms - operating leases (years) 3 years 4 months 17 days      
Weighted-average discount rate - operating leases ( as a percent) 7.33%      
Operating cash flows from operating leases $ 4,466      
Right-of-use assets obtained in exchange for lease obligations $ 17,389 $ 0 $ 0