Revenues - Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) agreement
Summary Of Deferred Revenue [Line Items]
Contract revenue recognized	$ 1,180
Minimum
Summary Of Deferred Revenue [Line Items]
Payment terms, range	30 days
Maximum
Summary Of Deferred Revenue [Line Items]
Payment terms, range	45 days
Nippon Shinyaku
Summary Of Deferred Revenue [Line Items]
Number of license, development and commercialization agreements | agreement	2
Contract revenue recognized	$ 1,200
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.