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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Schedule of future minimum lease payments under non-cancelable operating leases Future minimum lease payments under non-cancelable operating leases as of March 31, 2020 are as follows (in thousands of dollars):
 
Year Ending December 31,
Remainder of 2020$1,760  
20212,401  
20222,472  
20232,543  
20242,614  
Thereafter4,227  
Total future minimum lease payments16,017  
Less: amount representing interest3,435  
Present value of future lease payments12,582  
Less: short-term lease liabilities1,450  
Long-term lease liabilities$11,132