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Commitments and Contingencies - Service Agreements Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
Aug. 06, 2015
Dec. 31, 2011
Mar. 31, 2021
Mar. 31, 2020
CTS Agreement        
Service Agreements        
Service agreement term 5 years      
License fee amount     $ 643 $ 506
Master Services Agreement For Clinical Research and Related Services        
Service Agreements        
Service agreement amount paid upon execution of agreement   $ 151    
Payments made under agreement     $ 278 $ 516