Commitments and Contingencies - Manufacturing Agreements (Details) € in Millions, SFr in Millions, $ in Millions	1 Months Ended					6 Months Ended
	May 31, 2020 CHF (SFr)	May 31, 2020 USD ($)	Jul. 31, 2016 USD ($)	Jul. 31, 2016 EUR (€)	Jun. 30, 2016	Jun. 30, 2020 USD ($)
Affiliated Entity
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue from related parties						$ 23.7
Due to related parties						$ 1.0
Ypsomed Supply Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Services agreement, term	2 years	2 years			3 years
Services agreement, renewal term					2 years
Service agreement, period required for notice of non-renewal					18 months
Total minimum payments inclusive of milestone payments and one-time capacity fee	SFr 1.9	$ 2.1
Vetter Supply Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Services agreement, term					5 years
Services agreement, renewal term					2 years
Service agreement, period required for notice of non-renewal					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			$ 3.3	€ 2.9