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Subsequent Events - Additional Information (Details) |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Dec. 31, 2020 CAD ($) | Jan. 10, 2020 $ / shares shares | Jan. 01, 2020 | Nov. 30, 2019 USD ($) | Nov. 26, 2019 CAD ($) | Nov. 22, 2019 USD ($) $ / shares shares | Nov. 11, 2019 USD ($) $ / shares shares | Nov. 05, 2019 USD ($) | Oct. 30, 2019 USD ($) | Aug. 15, 2019 USD ($) | May 15, 2019 USD ($) | Feb. 28, 2019 USD ($) | Oct. 31, 2019 USD ($) $ / shares MW shares | Apr. 30, 2019 USD ($) | Oct. 31, 2019 USD ($) $ / shares shares | Oct. 31, 2019 USD ($) $ / shares MW shares | Oct. 31, 2019 CAD ($) MW shares | Oct. 31, 2018 USD ($) shares | Oct. 31, 2017 USD ($) shares | Dec. 31, 2021 CAD ($) | Jan. 14, 2020 shares | Dec. 31, 2019 USD ($) | May 09, 2019 USD ($) | May 08, 2019 | Feb. 06, 2019 USD ($) | Apr. 30, 2017 shares
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,786,000 |  | $ 22,817,000 | $ 20,398,000 |  |  |  |  |  |  |
Long-term line of credit, discount |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,251,000 |  | $ 4,251,000 | 4,251,000 |  |  |  |  |  |  |  |  |  |
Common stock, shares reserved for issuance | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,500,000
Sale of common stock, net of fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 43,666,000 |  | $ 7,129,000 | $ 12,431,000 |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of fees (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 119,128,677 | 119,128,677 | 476,265 | 603,786 |  |  |  |  |  |  |
Sale of common stock, net of fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,000 |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payment date |  |  |  |  |  |  |  |  | Oct. 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of dividend payment |  |  |  |  |  |  |  |  | $ 2,400,000 | $ 1,600,000 | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends payable date to be paid |  |  |  |  |  |  |  |  | Nov. 15, 2019 | Aug. 15, 2019 | May 15, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  |  |  | 5.00% | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] | Dividend Declared One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Previous dividend payment date |  |  |  |  |  |  |  |  | May 15, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] | Dividend Declared Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Previous dividend payment date |  |  |  |  |  |  |  |  | Aug. 15, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Cumulative Redeemable Exchangeable Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of dividend payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.25% | 1.25% |  |  |  |  |  |  |  |  |
Scenario Forecast [Member] | Class A Cumulative Redeemable Exchangeable Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued and unpaid dividend obligation | $ 21,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,500,000 |  |  |  |  |  |
Preferred stock, redemption amount | $ 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,500,000 |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Groton CT [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposition,refinancing or tax equity investment consummated |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Second Funding [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement requires to establish debt reserve |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  | 5,000,000 | $ 5,000,000 |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of fees (in shares) | shares |  | 9,396,319 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares reserved for issuance | shares |  | 2,603,681 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement [Member] | Initial Funding Warrants [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lenders warrants to purchase common stock | shares |  | 6.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement [Member] | Second Funding [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lenders warrants to purchase common stock | shares |  | 6.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement [Member] | Exercise Price 0.242 [Member] | Second Funding [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  | $ 0.242 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants or rights exercised | shares |  | 12.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement [Member] | Exercise Price 0.310 [Member] | Initial Funding Warrants [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  | $ 0.310 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrants or rights exercised | shares |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement [Member] | Groton Project [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  |  |  |  |  |  |  |  |  |  |  | 7.4 |  |  |  |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement [Member] | LIPA Yaphank Solid Waste Management Project [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  |  |  |  |  |  |  |  |  |  |  | 7.4 |  |  |  |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement [Member] | Tulare BioMAT Project [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  |  |  |  |  |  |  |  |  |  |  | 2.8 |  |  |  |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement [Member] | Senior Secured Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  | 200,000,000 | 200,000,000 |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement [Member] | Second Funding [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drew down to fully repay debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,500,000 |  |  |  |  |  |  |  |  |  |
Long-term line of credit, discount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600,000 |  | $ 1,600,000 | $ 1,600,000 |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement [Member] | Second Funding [Member] | Exercise Price 0.242 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.242 |  | $ 0.242 | $ 0.242 |  |  |  |  |  |  |  |  |  |
Class of warrants or rights exercised | shares |  |  |  |  |  |  |  |  |  |  |  |  | 8,000,000 |  | 8,000,000 | 8,000,000 |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement [Member] | Second Funding [Member] | Exercise Price 0.620 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.620 |  | $ 0.620 | $ 0.620 |  |  |  |  |  |  |  |  |  |
Class of warrants or rights exercised | shares |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  | 6,000,000 | 6,000,000 |  |  |  |  |  |  |  |  |  |
Orion Credit Agreement [Member] | Second Funding [Member] | Groton Project [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.4 | 7.4 |  |  |  |  |  |  |  |  |
Orion Credit Agreement [Member] | Second Funding [Member] | LIPA Yaphank Solid Waste Management Project [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of plant | MW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.4 | 7.4 |  |  |  |  |  |  |  |  |
New Construction Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 23,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan advance |  |  |  |  |  |  |  |  |  |  |  | 9,700,000 |  | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Total outstanding balance |  |  |  |  |  |  |  |  |  |  |  | $ 11,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Connecticut Green Bank Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,555,000 |  | $ 7,555,000 | $ 7,555,000 |  | $ 6,052,000 |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,900,000 |  |  |  |  |  |  |  |
Accrued fees payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 404,000 |  |  |
Connecticut Green Bank Loans [Member] | Groton Commitment Letter [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated project term loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |
Connecticut Green Bank Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |
Debt instrument, interest rate, increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |
Tulare BioMAT [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposition,refinancing or tax equity investment consummated |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Orion Credit Agreement [Member] | Second Funding [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lenders warrants to purchase common stock | shares |  |  |  |  |  |  |  |  |  |  |  |  | 14,000,000 |  | 14,000,000 | 14,000,000 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares reserved for issuance | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,290,934 |  |  |  |  |
Subsequent Event [Member] | Series I Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate amount of dividend payment |  |  |  |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Class A Cumulative Redeemable Exchangeable Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Orion Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drew down to fully repay debt outstanding |  |  |  |  |  | $ 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Orion Credit Agreement [Member] | Second Funding [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Drew down to fully repay debt outstanding |  |  |  |  |  | 65,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term line of credit, discount |  |  |  |  |  | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Orion Credit Agreement [Member] | Second Funding [Member] | Exercise Price 0.242 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lenders warrants to purchase common stock | shares |  |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  | $ 0.242 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Orion Credit Agreement [Member] | Second Funding [Member] | Exercise Price 0.620 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  | $ 0.620 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lenders warrants to purchase common stock | shares |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Connecticut Green Bank Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |
Subsequent Event [Member] | Joint Development Agreement [Member] | Exxon Mobile Research And Engineering Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for exclusivity and technology access fee |  |  |  | $ 5,000,000 |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Sales Agreement [Member] | B. Riley FBR, Inc and Oppenheimer & Co. Inc. [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of fees (in shares) | shares |  |  |  |  |  |  | 7,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average sale of stock price per share | $ / shares |  |  |  |  |  |  | $ 0.46 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period on sales agreement |  |  |  |  |  |  | $ 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock net of fees |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of common stock |  |  |  |  |  |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net of fees |  |  |  |  |  |  | $ 17,998,846 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Maximum [Member] | Orion Credit Agreement [Member] | Second Funding [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lenders warrants to purchase common stock | shares |  |  |  |  |  | 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Maximum [Member] | Joint Development Agreement [Member] | Exxon Mobile Research And Engineering Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  |  | 45,000,000 |  |  |  | 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone-based payments |  |  |  | $ 10,000,000 |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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