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Nature of Business and Basis of Presentation - Additional Information (Details) $ in Thousands |  |  | 1 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 19, 2019 MW | Dec. 13, 2018 MW | May 08, 2019 shares | Jul. 31, 2019 USD ($) shares | Sep. 30, 2019 USD ($) | Sep. 04, 2019 USD ($) | May 07, 2019 shares | Oct. 31, 2018 USD ($) shares
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Reverse stock split |  |  | 1-for-12 reverse stock split |  |  |  |  |
Reverse stock split, conversion ratio |  |  | 0.084 |  |  |  |  |
Common stock, shares outstanding | shares |  |  | 15,284,269 | 118,387,637 |  |  | 183,411,230 | 7,972,686
Common stock, shares authorized | shares |  |  | 225,000,000 | 225,000,000 |  |  |  | 225,000,000
Preferred stock, shares authorized | shares |  |  | 250,000 | 250,000 |  |  |  |
Long-term Line of Credit |  |  |  | $ 1,800 |  |  |  |
Hercules Capital, Inc. [Member] |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Maturity date |  |  |  | Oct. 22, 2019 |  |  |  |
Long-term Line of Credit |  |  |  | $ 7,426 |  |  |  | $ 25,343
Proceeds from common stock sales |  |  |  | 30.00% |  |  |  |
Original maturity date |  |  |  | Apr. 01, 2020 |  |  |  |
Hercules Capital, Inc. [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Maturity date |  |  |  | Oct. 21, 2019 |  |  |  |
Amount letters of intent from tax equity investors |  |  |  | $ 18,000 |  |  |  |
Hercules Capital, Inc. [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  |  | $ 5,600 |  |
Hercules Capital, Inc. [Member] | Subsequent Event [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  |  | $ 5,000 |  |  |
NRG Energy [Member] |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  | $ 5,750 |  |  |  |
Maturity date description |  |  |  | The Maturity date of each note payable to NRG is now the date that is the earliest of (a) September 30, 2019, (b) the commercial operation date or substantial completion date, as applicable, with respect to the fuel cell project owned by the co-borrower under such note, and (c) the repayment in full or the closing of a refinancing of the Company’s indebtedness with Hercules. NRG may also accelerate the maturity dates if it determines, in its sole discretion, that the deems that the Company is not making sufficient progress towards the completion of the construction of the 2.8 MW Tulare BioMAT projet in California. |  |  |  |
NRG Energy [Member] | Tulare BioMAT [Member] | California [Member] |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Capacity of plant | MW | 2.8 | 2.8 |  |  |  |  |  |
Fifth Third Binding Loan Agreement [Member] |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Maturity date |  | Oct. 21, 2019 |  |  |  |  |  |
Fifth Third Binding Loan Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |
Amount letters of intent from tax equity investors |  |  |  | $ 18,000 |  |  |  |

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