Fair Value of Financial Assets and Liabilities - Additional Information (Details) - USD ($)	Jan. 21, 2020	Mar. 31, 2020	Dec. 31, 2019
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Discounted cash flow include a discount rates		20.00%	15.00%
Derivative liability for the exchange option, fair value	$ 27,038,000	$ 25,359,000
RLNs liability		$ 11,880,000
Private Placement \| Securities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument price per ordinary share	$ 1.00
Debt instrument, shares embedded within each unit, shares	1,000
Debt instrument, shares embedded within each unit, value	$ 1,000
Private Placement \| RLNs
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument, aggregate potential payment capped value	$ 160,000
Debt instrument, aggregate potential payment capped rate	4,000 times
Private Placement \| RLNs \| Minimum
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument, discount rate applied for royalty linked notes	18.00%
Private Placement \| RLNs \| Maximum
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Debt instrument, discount rate applied for royalty linked notes	22.00%