Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - License Agreements (Details)

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Commitments and Contingencies - License Agreements (Details) - TMRC - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2019
Dec. 31, 2018
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]        
Up-front license fee   $ 1,000,000    
Payment of up-front license fee   500,000    
Payments per indication due upon the successful achievement of clinical and regulatory milestones   $ 13,000,000    
Payments made upon achievement of development milestone $ 1,000,000      
Payments made under the supply management agreement     $ 0 $ 0