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Nature of the Business and Operations and Liquidity - Additional Information (Detail) $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 78 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 06, 2019 | Jul. 04, 2018 USD ($) | Jul. 03, 2018 USD ($) installment | Mar. 28, 2018 USD ($) | Feb. 01, 2018 USD ($) | May 10, 2017 USD ($) | May 26, 2017 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2018 USD ($) employee | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) employee | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) employee | Mar. 31, 2018 USD ($)
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings (accumulated deficit) |  |  |  |  |  |  |  |  | $ (970,479) |  | $ (970,479) |  | $ (970,479) | $ (988,333)
Cash and cash equivalents |  |  |  |  |  |  |  |  | 56,169 |  | 56,169 |  | $ 56,169 | 34,084
Net cash used in operating activities |  |  |  |  |  |  |  |  |  |  | 23,595 | $ (13,539) |  |
Net Sinovel settlement |  |  |  |  |  |  |  |  | $ 28,720 | $ 0 | $ 28,720 | 0 |  |
Number of workforce persons | employee |  |  |  |  |  |  |  |  | 225 |  | 225 |  | 225 |
Cash flows from financing activities |  |  |  |  |  |  |  |  |  |  | $ (325) | $ 15,188 | $ 84,900 |
Proceeds from additional equity offering |  |  |  |  |  | $ 17,000 | $ 17,000 |  |  |  |  |  |  |
Notes receivable, long term portion |  |  |  |  |  |  |  |  | $ 2,776 |  | $ 2,776 |  | $ 2,776 | $ 2,559
Sinovel Wind Group Co. Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Sinovel settlement |  |  |  |  |  |  |  |  | $ 28,700 |  |  |  |  |
Sinovel settlement |  |  | $ 57,500 |  |  |  |  |  |  |  |  |  |  |
Proceeds from settlement |  | $ 32,500 |  |  |  |  |  |  |  |  |  |  |  |
Number of installments | installment |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Settlement, amount awarded |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |
64 Jackson LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase and sale agreement, total consideration |  |  |  | $ 23,000 | $ 23,000 |  |  |  |  |  |  |  |  |
Purchase and sale agreement, sale of property |  |  |  | 17,000 |  |  |  |  |  |  |  |  |  |
Notes receivable, long term portion |  |  |  | 6,000 | $ 6,000 |  |  |  |  |  |  |  |  |
Purchase and sale agreement, proceeds from sale of property, plant and equipment, net |  |  |  | $ 16,900 |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 1.96% |  |  |  |  | 1.96% |  | 1.96% |  | 1.96% |
Inox Wind Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Strategic agreements value |  |  |  |  |  |  |  | $ 210,000 |  |  |  |  |  |
Manufacturing agreement period, additional period required |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Forecast | Sinovel Wind Group Co. Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment period | 10 months |  |  |  |  |  |  |  |  |  |  |  |  |

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