Revenues - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($) agreement	Sep. 30, 2020 USD ($) agreement
Financing and Payment [Line Items]
Contract revenue recognized		$ 3,540
Minimum
Financing and Payment [Line Items]
Payment terms, range		30 days
Maximum
Financing and Payment [Line Items]
Payment terms, range		45 days
Nippon Shinyaku
Financing and Payment [Line Items]
Number of license, development and commercialization agreements | agreement	2	2
Contract revenue recognized	$ 1,200	$ 3,500
Revenue, performance obligation, description of timing		The deferred revenue balances are being recognized over an average of four years representing the period over which we expect to perform our research and developments obligations under each agreement.