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Leases - Operating Leases in the Consolidated Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Leases [Abstract]      
Operating lease assets $ 21,158   $ 0
Operating lease liabilities 1,747   539
Operating lease liabilities, net of current portion 15,904   $ 11,347
Total operating lease liabilities $ 17,651 $ 11,900  
Weighted-average remaining lease term in years 9 years 7 months 17 days    
Weighted-average discount rate 5.36%