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Debt - Summary of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Current portion of Senior Secured Debenture $ 0 $ 8,377
Non-current portion of Senior Secured Debenture $ 0 2,611
Total debt   10,988
Secured Debt | Securities Purchase Agreement    
Debt Instrument [Line Items]    
Current portion of Senior Secured Debenture   8,377
Non-current portion of Senior Secured Debenture   $ 2,611