Summary of Significant Accounting Policies - Revenue Recognition (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) product
Revenue Recognition
Sales return period prior to expiry date	6 months
Sales return period subsequent to expiry date	12 months
Number of commercial products | product	2
Maximum
Revenue Recognition
Product shelf life	48 months
License and collaboration agreements
Revenue Recognition
Guaranteed minimum amounts	$ 0
Royalty revenue agreements
Revenue Recognition
Guaranteed minimum amounts	$ 0