Sale of Future Royalties - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended		15 Months Ended
	Jul. 02, 2019	Jan. 01, 2019	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020
Other Liabilities Disclosure [Line Items]
Royalty guarantees commitments percentage			2.50%
Non-cash royalty revenue			$ 656	$ 171
Non-cash interest expense			1,039	0
OMERS
Other Liabilities Disclosure [Line Items]
Annual royalty revenue	$ 500,000
Gross proceeds from sale of royalty interest. before advisory fees		$ 20,000
Entitlement of royalties to be received	$ 30,000
Royalty guarantees commitments percentage	100.00%
Future royalty payments	$ 30,000
Transaction costs on sale of royalties	$ 1,500
Effective annual interest rate on royalty liability	22.00%
Non-cash royalty revenue			(700)	$ (200)	$ (2,500)
Non-cash interest expense			$ 1,000
OMERS | Minimum
Other Liabilities Disclosure [Line Items]
Royalty interest sold percentage	1.00%
OMERS | Maximum
Other Liabilities Disclosure [Line Items]
Royalty interest sold percentage	2.33%