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Related Party Transactions - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Related Party Transactions      
Other assets $ 37,422   $ 27,236
Consulting service fee for IPO 1,000    
Consulting service fee for follow on offering 500    
Adjustment to additional paid in capital due to consulting service fee 1,500    
Refinitiv      
Related Party Transactions      
Other assets 2,700    
Refinitiv | Operating Expense Reimbursement      
Related Party Transactions      
Related party expense $ 300 $ 1,000