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Commitments and Contingencies - Additional Information (Detail) $ in Thousands | May 06, 2019 USD ($) | Jul. 04, 2018 USD ($) | Jul. 03, 2018 USD ($) installment | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($)
--- | --- | --- | --- | --- | ---
Commitments And Contingencies [Line Items] |  |  |  |  |
Restricted cash included in long-term assets |  |  |  | $ 165 | $ 165
Subsequent Event | Sinovel Wind Group Co. Ltd. |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Proceeds from settlement |  |  | $ 57,500 |  |
Number of installments | installment |  |  | 2 |  |
Settlement, amount awarded |  | $ 32,500 |  |  |
Payment period |  |  | 10 months |  |
Forecast | Sinovel Wind Group Co. Ltd. |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Settlement, amount awarded | $ 25,000 |  |  |  |

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