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Commitments and Contingencies - Summary of Warranty Reserve Activity (Details)
$ in Thousands
3 Months Ended
Dec. 31, 2019
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
Beginning balance, September 30, 2019 $ 292
Warranties issued/accrued 0
Warranty settlements (82)
Ending balance, December 31, 2019 $ 210