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Convertible Debt Instruments - Valuation Inputs (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
Disclosure of detailed information about borrowings [line items]  
Exchange rate 0.154
Share price $ 207
Convertible debt instruments | Probability of a qualifying financing event taking place  
Disclosure of detailed information about borrowings [line items]  
Unobservable input, liabilities 95
Convertible Debt 1 | Discount rate  
Disclosure of detailed information about borrowings [line items]  
Unobservable input, liabilities 39
Convertible Debt 2 | Discount rate  
Disclosure of detailed information about borrowings [line items]  
Unobservable input, liabilities 25