Commitments and Contingencies - Manufacturing Agreements (Details) € in Millions, SFr in Millions, $ in Millions	1 Months Ended				3 Months Ended
	Jul. 31, 2016 USD ($)	Jul. 31, 2016 EUR (€)	Jun. 30, 2016 CHF (SFr)	Jun. 30, 2016 USD ($)	Mar. 31, 2020 USD ($)
Ypsomed Supply Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Services agreement, term			3 years	3 years
Services agreement, renewal term			2 years	2 years
Service agreement, period required for notice of non-renewal			18 months	18 months
Total minimum payments inclusive of milestone payments and one-time capacity fee			SFr 2.4	$ 2.5
Vetter Supply Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Services agreement, term			5 years	5 years
Services agreement, renewal term			2 years	2 years
Service agreement, period required for notice of non-renewal			2 years	2 years
Lonza Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Services agreement, term	6 years	6 years
Services agreement, renewal term	3 years	3 years
Service agreement, period required for notice of non-renewal	24 months	24 months
Annual minimum batches	$ 3.2	€ 2.9
Affiliated Entity
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue from related parties					$ 23.7
Due to related parties					0.6
Accounts receivable, related parties					$ 12.8