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Subsequent Events - Additional Information (Details) $ / shares in Units, $ in Millions							1 Months Ended	12 Months Ended
	Dec. 18, 2020 USD ($)	Dec. 18, 2020 CAD ($)	Dec. 07, 2020 USD ($) $ / shares shares	Dec. 04, 2020 USD ($) $ / shares shares	Dec. 01, 2020 $ / shares shares	Nov. 30, 2020 USD ($)	Oct. 31, 2020 $ / shares shares	Oct. 31, 2020 $ / shares shares	Oct. 31, 2019 $ / shares shares	Oct. 31, 2018 shares	Dec. 31, 2020 CAD ($)	Oct. 06, 2020 $ / shares	Apr. 30, 2020 $ / shares	Jan. 08, 2020 $ / shares	May 08, 2019 shares	May 07, 2019 shares	Oct. 31, 2017 shares
Subsequent Event [Line Items]
Share Price | $ / shares							$ 2.00	$ 2.00	$ 0.24			$ 1.92	$ 2.02	$ 2.29
Common stock, shares outstanding							294,706,758	294,706,758	193,608,684						15,284,269	183,411,230
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares							$ 0.242	$ 0.242				$ 0.242
Common Stock [Member]
Subsequent Event [Line Items]
Sale of common stock, net of fees (in shares)								86,307,932	119,128,677	476,265
Common stock, shares outstanding							294,706,758	294,706,758	193,608,684	7,972,686							5,791,068
Underwriting Agreement
Subsequent Event [Line Items]
Sale of common stock, net of fees (in shares)							50,000,000.0
Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock, shares outstanding				319,706,758
Subsequent Event [Member] | Payoff Letter [Member]
Subsequent Event [Line Items]
Long-term line of credit after discount | $			$ 87,300,000
Debt instrument prepayment premium | $			4,000,000			$ 14,900,000
Repayments of lines of credit | $			$ 11,200,000
Subsequent Event [Member] | Orion credit agreement [Member]
Subsequent Event [Line Items]
Class of warrants or rights issued			2,700,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares			$ 0.242
Stock exercises price | $			$ 653,400
Subsequent Event [Member] | Enbridge Inc. [Member] | Payoff Letter [Member]
Subsequent Event [Line Items]
Carrying value of preferred shares, total | $											$ 27.4
Preferred stock, redemption amount | $											4.3
Dividends payable | $											$ 23.1
Final payment To payoff	$ 21,500,000	$ 27.4
Subsequent Event [Member] | Maximum [Member] | Payoff Letter [Member]
Subsequent Event [Line Items]
Debt prepayment premium amount to be waived | $			$ 4,000,000
Subsequent Event [Member] | Minimum [Member] | Common Stock [Member] | Orion credit agreement [Member]
Subsequent Event [Line Items]
Class of warrants or rights issued				2,700,000
Subsequent Event [Member] | Underwriting Agreement
Subsequent Event [Line Items]
Stock issued to underwriters					19,822,219
Aggregate number of shares issued					14,696,320
Share Price | $ / shares					$ 6.50
Sale of common stock, net of fees (in shares)				25,000,000
Stock issued during period on sales agreement | $				$ 162,500,000
Underwriting discounts and commissions | $ / shares				$ 0.2275
Net proceeds on sales agreement | $				$ 156,300,000
Subsequent Event [Member] | Underwriting Agreement | Maximum [Member]
Subsequent Event [Line Items]
Option to purchase additional common stock shares					5,177,781

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