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Commitments and Contingencies (Details) - USD ($) $ in Thousands | May 16, 2017 | Apr. 19, 2017 | Sep. 30, 2019 | Aug. 01, 2017
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Loss Contingencies [Line Items] |  |  |  |
Penalty issued by OSHA |  | $ 138 |  |
Payments for legal settlements | $ 75 |  |  |
Clean Air Act Violation |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Fine payable due to plea agreement |  |  | $ 1,000 |
EPA Administrative Civil Penalty |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Fine payable due to plea agreement |  |  | $ 251 |
Loss contingency, estimate of possible loss |  |  |  | $ 250

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