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Borrowings - Outstanding Borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Long-term Debt, Unclassified [Abstract]    
Term loan, current   $ 141
Term loan, non-current   29,418
Convertible notes $ 56,589  
Total long-term portion of notes payable $ 56,589 $ 29,559