Commitment and Contingencies - Additional Information (Details)	Jan. 21, 2020 USD ($) RNL $ / RNL	Nov. 18, 2015 USD ($)
Royalty-Linked Notes \| Private Placement
Other Commitments [Line Items]
Aggregate principal amount	$ 2,579,400
Debt instrument outstanding portion \| $ / RNL	0.04
Debt instrument note price per unit \| $ / RNL	2.00
Debt instrument maturity date	Dec. 31, 2045
Debt instrument, aggregate potential payment capped value	$ 160,000
Debt instrument, aggregate potential payment capped rate	4,000
Number of debt instruments within each notes \| RNL	50
Maximum return amount for each unit	$ 8,000,000
Pfizer License Agreement \| Royalty-Linked Notes \| Private Placement
Other Commitments [Line Items]
Aggregate principal amount	$ 2,579,400
Debt instrument outstanding portion \| $ / RNL	0.04
Debt instrument note price per unit \| $ / RNL	2.00
Debt instrument maturity date	Dec. 31, 2045
Debt instrument, aggregate potential payment capped value	$ 160,000
Debt instrument, aggregate potential payment capped rate	4,000
Number of debt instruments within each notes \| RNL	50
Maximum return amount for each unit	$ 8,000,000
Pfizer License Agreement \| Minimum
Other Commitments [Line Items]
Potential future regulatory milestone and sales milestone payments upon achievement of net sales		$ 250,000,000
Pfizer License Agreement \| Maximum
Other Commitments [Line Items]
Potential future regulatory milestone and sales milestone payments upon achievement of net sales		$ 1,000,000,000