Warrant Liabilities - Narratives (Details) | | | | | 1 Months Ended | 3 Months Ended | 6 Months Ended | | |
Jun. 30, 2022 USD ($) $ / shares shares | Sep. 29, 2021 $ / shares shares | Sep. 28, 2021 $ / shares shares | Jan. 08, 2021 d $ / shares shares | Mar. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) d $ / shares | Feb. 29, 2020 USD ($) $ / shares shares | Mar. 31, 2022 d $ / shares shares | Jun. 30, 2022 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jan. 08, 2018 shares |
Class of Stock [Line Items] | | | | | | | | | | | | |
Exchange ratio | | 1.0754 | | | | | | | | | | |
Shares issued (in shares) | shares | | 350,000 | | | | | | | | | | |
Common stock, par value (in usd per share) | $ / shares | $ 0.0001 | $ 0.0001 | | | | $ 0.0001 | | | $ 0.0001 | | | |
Borrowing under revolving line of credit | | | | | | | | | $ 12,491,000 | $ 14,451,000 | | |
PIPE Investment | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Transaction costs | | | | | $ 4,161,000 | | | | | | | |
IPO | STPC | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Units issued (in shares) | shares | | | | 40,250,000 | | | | | | | | |
Notes Payable | Loan and Security Agreement | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | $ 20,000,000 | | | | | |
Notes Payable | Loan and Security Agreement, second tranche | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Available borrowing | | | | | | | $ 15,000,000 | | | | | |
Notes Payable | New Loan and Security Agreement | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Aggregate principal amount | | | | | | | | | | | $ 20,000 | |
Available borrowing | | | | | | | | | | | 20,000 | |
Notes Payable | New Loan and Security Agreement, Remaining Commitment | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Available borrowing | | | | | | | | | | | 20,000 | |
Convertible Notes Payable | Second tranche | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Available borrowing | | | | | | $ 20,000 | | | | | | |
Borrowing under revolving line of credit | $ 20,000,000 | | | | | | | | | | | |
Convertible Notes Payable | Convertible Loan and Security Agreement | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Available borrowing | | | | | | 80,000,000 | | | | | | |
Borrowing under revolving line of credit | | | | | | $ 80,000,000 | | | | | | |
New Benson Hill Common Stock | IPO | STPC | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Shares issued per unit (in shares) | shares | | | | 1 | | | | | | | | |
Legacy Benson Hill Common Stock | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Common stock, par value (in usd per share) | $ / shares | | | $ 0.001 | | | | | | | | | |
Warrants To Purchase Preferred Stock | Series C-1 and other preferred shares | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrants issued (in shares) | shares | | | | | | | 1,077,000 | | | | | |
Warrants To Purchase New Benson Hill Common Stock | New Benson Hill Common Stock | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrants (in shares) | shares | | | | | | | 1,158,000 | | | | | |
Warrant exercise price (in usd per share) | $ / shares | | $ 9.30 | | | | | $ 3.43 | | | | | |
Warrants exchanged for shares (in shares) | shares | | 242,000 | | | | | | | | | | |
Warrant exercise price (in usd per share) | $ / shares | | | $ 10 | | | | | | | | | |
Warrants issued (in shares) | shares | | | 225,000 | | | | | | | | | |
Warrants To Purchase New Benson Hill Common Stock | New Benson Hill Common Stock | Notes Payable | Loan and Security Agreement | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrants liability (asset) fair value | | | | | | | $ 3,332,000 | | | | | |
Warrants To Purchase New Benson Hill Common Stock | New Benson Hill Common Stock | Notes Payable | Loan and Security Agreement, second tranche | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrants liability (asset) fair value | | | | | | | $ 1,248,000 | | | | | |
Warrants to purchase common or Series D preferred stock | Common stock, Series D preferred shares, or any subsequent preferred shares | Notes Payable | New Loan and Security Agreement | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrants liability (asset) fair value | | | | | | | | | | | 3,523,000 | |
Warrants to purchase common or Series D preferred stock | Common stock, Series D preferred shares, or any subsequent preferred shares | Notes Payable | New Loan and Security Agreement, Remaining Commitment | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrants liability (asset) fair value | | | | | | | | | | | $ 1,028,000 | |
Warrants For Legacy Benson Hill Common Stock | Legacy Benson Hill Common Stock | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrants exchanged for shares (in shares) | shares | | | 325,000 | | | | | | | | | |
Convertible Notes Payable Warrants | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrant exercise price (in usd per share) | $ / shares | | | | | | $ 2.47 | | | | | | |
Aggregate number of shares numerator | | | | | | $ 3,000,000 | | | | | | |
Gross proceeds | | | | | | $ 20,000,000 | | | | | | |
Consecutive trading days | d | | | | | | 14 | | | | | | |
Fair value of warrants | | | | | | $ 1,690,000 | | | | | | |
Convertible Notes Payable Warrants, Second Tranche | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Fair value of warrants | | | | | | $ 423,000 | | | | | | |
PIPE Investment Warrants | PIPE Investment | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrants (in shares) | shares | 8,716,000 | | | | | | | | 8,716,000 | | | |
Units issued (in shares) | shares | | | | | 26,150 | | | | | | | |
Units issued (in usd per share) | $ / shares | | | | | $ 3.25 | | | $ 3.25 | | | | |
Aggregate purchase price | | | | | | | | | $ 85,000,000 | | | |
Transaction costs | | | | | $ 705,000 | | | | | | | |
Warrant transaction costs (in shares) | shares | 362,000 | | | | | | | | 362,000 | | | |
Maximum share increase percent | | | | | 19.99% | | | | | | | |
PIPE Investment Warrants | PIPE Investment | Redemption, stock equals or exceeds $18.00 | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrant exercise price (in usd per share) | $ / shares | | | | | $ 3.90 | | | 3.90 | | | | |
PIPE Investment Warrants | PIPE Investment | Redemption, stock equals or exceeds $10.00 | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrant exercise price (in usd per share) | $ / shares | | | | | 9.75 | | | 9.75 | | | | |
Warrant redemption, price per common stock (in usd per share) | $ / shares | | | | | $ 0.10 | | | $ 0.10 | | | | |
Trading period after business combination used to measure dilution of warrant | d | | | | | | | | 20 | | | | |
Number of trading days for determining the share price | d | | | | | | | | 30 | | | | |
PIPE Investment Warrants | New Benson Hill Common Stock | PIPE Investment | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Shares issued per unit (in shares) | shares | | | | | | | | 1 | | | | |
Public Warrants and Private Placement Warrants | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Trading period after business combination used to measure dilution of warrant | d | | | | 10 | | | | | | | | |
Number of days prior to the date of notifying the warrant holders for determining the total trading period | | | | | | | | | 3 days | | | |
Public Warrants and Private Placement Warrants | Redemption, stock equals or exceeds $18.00 | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrant redemption, price per common stock (in usd per share) | $ / shares | | | | $ 18 | | | | | | | | |
Trading period after business combination used to measure dilution of warrant | d | | | | 20 | | | | | | | | |
Number of trading days for determining the share price | d | | | | 30 | | | | | | | | |
Number of days of notice to be given for the redemption of warrants | | | | 30 days | | | | | | | | |
Warrant redemption period | | | | 30 days | | | | | | | | |
Number of days prior to the date of notifying the warrant holders for determining the total trading period | | | | | | | | | 3 years | | | |
Public Warrants and Private Placement Warrants | Redemption, stock equals or exceeds $10.00 | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrant redemption, price per common stock (in usd per share) | $ / shares | | | | $ 10 | | | | | | | | |
Trading period after business combination used to measure dilution of warrant | d | | | | 20 | | | | | | | | |
Number of trading days for determining the share price | d | | | | 30 | | | | | | | | |
Number of days prior to the date of notifying the warrant holders for determining the total trading period | | | | 3 days | | | | | 3 days | | | |
Public Warrants and Private Placement Warrants | New Benson Hill Common Stock | Maximum | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Shares of common stock per warrant (in shares) | shares | | | | 0.361 | | | | | | | | |
Public Warrants and Private Placement Warrants | New Benson Hill Common Stock | Redemption, stock equals or exceeds $18.00 | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrant exercise price (in usd per share) | $ / shares | | | | $ 0.01 | | | | | | | | |
Public Warrants and Private Placement Warrants | New Benson Hill Common Stock | Redemption, stock equals or exceeds $10.00 | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrant exercise price (in usd per share) | $ / shares | | | | $ 0.10 | | | | | | | | |
Public Warrants | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrants (in shares) | shares | | | 10,063,000 | | | | | | | | | |
Warrants term | | | | 5 years | | | | | | | | |
Public Warrants | IPO | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Shares of common stock per warrant (in shares) | shares | | | | | | | | | | | | 0.25 |
Public Warrants | New Benson Hill Common Stock | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrant exercise price (in usd per share) | $ / shares | | | | $ 11.50 | | | | | | | | |
Public Warrants | New Benson Hill Common Stock | IPO | STPC | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrants (in shares) | shares | | | | 10,063,000 | | | | | | | | |
Private Placement Warrants | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrants (in shares) | shares | | | 6,553,000 | | | | | | | | | |
Private Placement Warrants | New Benson Hill Common Stock | IPO | STPC | | | | | | | | | | | | |
Class of Stock [Line Items] | | | | | | | | | | | | |
Warrants (in shares) | shares | | | | 6,553,000 | | | | | | | | |