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Commitments and Contingencies - Revenue sharing commitment update (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 14, 2017
Mar. 31, 2020
Long-term Purchase Commitment [Line Items]    
Payments made to date to SEED   $ 0.0
SEED    
Long-term Purchase Commitment [Line Items]    
Percentage of revenue sharing commitment 15.00%  
Percentage of revenue sharing commitment after first million dollars of revenue 20.00%