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Research Funding (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 41 Months Ended
Sep. 30, 2020
May 31, 2019
Mar. 31, 2018
Dec. 31, 2017
May 31, 2017
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Feb. 28, 2017
Research and Development [Abstract]                  
Grants awarded           $ 8,600     $ 12,200
Funding of grant award         $ 5,700     $ 8,200  
Milestone payment received on grant award       $ 1,900          
Progress payment received on grant award     $ 300            
Research and Development Arrangement with Federal Government, Customer Funding to Offset Costs Incurred $ 46 $ 200              
Amortization of accrued grant funding to offset expense           $ 0 $ 700