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v3.21.1

Nature of Business and Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Thousands, $ in Millions |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 07, 2020 USD ($) | Feb. 28, 2021 USD ($) | Dec. 31, 2020 USD ($) $ / shares | Apr. 30, 2021 USD ($) | Dec. 17, 2020 USD ($) | Dec. 17, 2020 CAD ($) | Oct. 31, 2020 USD ($)
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents, unrestricted |  |  |  | $ 139,086 |  |  | $ 149,867
Underwritten Offering Shares | $ / shares |  |  | $ 25.0 |  |  |  |
Net proceeds from underwriting shares after deducting underwriting discounts and commissions |  |  | $ 156,400 |  |  |  |
Unrestricted cash |  |  |  | $ 47,500 |  |  |
Enbridge Inc. [Member] | Series 1 Preferred Shares [Member] |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Related Party Transaction, Due from (to) Related Party |  |  |  |  | $ 21,500 | $ 27.4 |
Sr. Secured Debt [Member] |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Settlement of outstanding principal payment and interest | $ 87,300 |  |  |  |  |  |
Unrestricted cash | $ 11,200 |  |  |  |  |  |
Liberty Bank Promissory Note (PPP Note) [Member] |  |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Repayments of debt |  | $ 6,500 |  |  |  |  |

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