Initial Public Offering	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Star Peak Energy Transition Corp [Member]
Initial Public Offering	Note 3—Initial Public Offering Public Units On August 20, 2020, the Company consummated its Initial Public Offering of 35,000,000 Units at $10.00 per Unit, generating gross proceeds of $350.0 million, and incurring offering costs of approximately $20.0 million, inclusive of approximately $12.3 million in deferred underwriting commissions. On August 26, 2020, the Company consummated the sale of 3,358,504 Units at the Initial Public Offering price at $10.00 per Unit pursuant to the notice of partial exercise from the underwriters, generating additional gross proceeds of approximately $33.6 million, and incurring additional offering costs of approximately $1.9 million, inclusive of approximately $1.2 million in deferred underwriting commissions. Each Unit consists of one share of Class A common stock (such shares of Class A common stock included in the Units being offered, the “Public Shares”), and one-third of one redeemable warrant (each, a “Public Warrant”). Each whole Public Warrant entitles the holder to purchase one share of Class A common stock at a price of $11.50 per share, subject to adjustment (see Note 6).	Note 4 — Initial Public Offering Public Units On August 20, 2020, the Company consummated its Initial Public Offering of 35,000,000 Units at $10.00 per Unit, generating gross proceeds of $350.0 million, and incurring offering costs of approximately $20.2 million, inclusive of approximately $12.3 million in deferred underwriting commissions. On August 26, 2020, the Company consummated the sale of 3,358,504 Units at the Initial Public Offering price at $10.00 per Unit pursuant to the notice of partial exercise from the underwriters, generating additional gross proceeds of approximately $33.6 million, and incurring additional offering costs of approximately $1.9 million, inclusive of approximately $1.2 million in deferred underwriting commissions. Each Unit consists of one share of Class A common stock (such shares of Class A common stock included in the Units being offered, the “Public Shares”), and one-third of one redeemable warrant (each, a “Public Warrant”). Each whole Public Warrant entitles the holder to purchase one share of Class A common stock at a price of $11.50 per share, subject to adjustment (see Note 6).

Initial Public Offering

3 Months Ended

12 Months Ended

Mar. 31, 2021

Dec. 31, 2020

Star Peak Energy Transition Corp [Member]

Note 3—Initial Public Offering

Public Units

On August 20, 2020, the Company consummated its Initial Public Offering of 35,000,000 Units at $10.00 per Unit, generating gross proceeds of $350.0 million, and incurring offering costs of approximately $20.0 million, inclusive of approximately $12.3 million in deferred underwriting commissions. On August 26, 2020, the Company consummated the sale of 3,358,504 Units at the Initial Public Offering price at $10.00 per Unit pursuant to the notice of partial exercise from the underwriters, generating additional gross proceeds of approximately $33.6 million, and incurring additional offering costs of approximately $1.9 million, inclusive of approximately $1.2 million in deferred underwriting commissions.

Each Unit consists of one share of Class A common stock (such shares of Class A common stock included in the Units being offered, the “Public Shares”), and one-third of one redeemable warrant (each, a “Public Warrant”). Each whole Public Warrant entitles the holder to purchase one share of Class A common stock at a price of $11.50 per share, subject to adjustment (see Note 6).

Note 4 — Initial Public Offering

Public Units

On August 20, 2020, the Company consummated its Initial Public Offering of 35,000,000 Units at $10.00 per Unit, generating gross proceeds of $350.0 million, and incurring offering costs of approximately $20.2 million, inclusive of approximately $12.3 million in deferred underwriting commissions. On August 26, 2020, the Company consummated the sale of 3,358,504 Units at the Initial Public Offering price at $10.00 per Unit pursuant to the notice of partial exercise from the underwriters, generating additional gross proceeds of approximately $33.6 million, and incurring additional offering costs of approximately $1.9 million, inclusive of approximately $1.2 million in deferred underwriting commissions.