Nature of Business and Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Thousands, $ in Millions	Dec. 31, 2020 USD ($) $ / shares	Dec. 07, 2020 USD ($)	Jan. 31, 2021 USD ($) shares	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			$ 178,570			$ 149,867
Underwritten Offering Shares | $ / shares	$ 25,000,000.0
Net proceeds from underwriting shares after deducting underwriting discounts and commissions	$ 156,400
Unrestricted cash			$ 47,500
Common stock, shares reserved for issuance | shares			5,185,674
Common Stock [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Common stock, shares available for issuance | shares			15,093,242
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