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Collaboration and Other Agreements - Boehringer Ingelheim International GmbH (Details) - Boehringer Collaboration and License Agreement - Boehringer Ingelheim International GmbH
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 61 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Oct. 31, 2015
USD ($)
numberOfProductCandidates
Collaboration And Other Agreements [Line Items]        
Term of agreement (in years)       5 years
Number of product candidates to develop | numberOfProductCandidates       2
Non-refundable upfront payment       $ 15.0
Development milestones $ 12.0      
Development milestones recognized   $ 12.0 $ 12.0