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Subsequent Events - Additional Information (Details)													1 Months Ended		6 Months Ended	12 Months Ended
	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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