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Basis of Presentation and Significant Accounting Policies - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
tranche
$ / shares
shares
Sep. 30, 2023
USD ($)
trading_day
segment
tranche
line_of_business
$ / shares
shares
Dec. 31, 2022
USD ($)
Class of Stock [Line Items]      
Number of operating segments | segment   1  
Number of reportable segments | segment   1  
Number of line of businesses | line_of_business   1  
Cash deposits, amounts in excess of FDIC limit | $ $ 544,727 $ 544,727 $ 4,644
Maturity of time deposits 6 months 6 months  
Tax receivable agreement, net cash savings, percentage 0.75 0.75  
Useful Life 20 years 20 years  
Demonstration Plant      
Class of Stock [Line Items]      
Useful Life 7 years 7 years  
OpCo      
Class of Stock [Line Items]      
Subsidiary, ownership percentage 32.60% 32.60%  
Price Based Lockup Shares      
Class of Stock [Line Items]      
Lockup shares, transfer threshold   3 years  
Time-Based Lockup Shares      
Class of Stock [Line Items]      
Lockup shares, transfer threshold   1 year  
Price Based Lockup Shares, Transfer Tranche One | Price Based Lockup Shares      
Class of Stock [Line Items]      
Lockup shares, percentage of shares transferable 0.33 0.33  
Price Based Lockup Shares, Transfer Tranche Two | Price Based Lockup Shares      
Class of Stock [Line Items]      
Lockup shares, percentage of shares transferable 0.33 0.33  
Price Based Lockup Shares, Transfer Tranche Three | Price Based Lockup Shares      
Class of Stock [Line Items]      
Lockup shares, percentage of shares transferable 1 1  
NCI Holders | OpCo      
Class of Stock [Line Items]      
Noncontrolling interest, ownership percentage 67.40% 67.40%  
Class A Common Stock      
Class of Stock [Line Items]      
Common stock subject to vesting and transfer restrictions (in shares) | shares 986,775 986,775  
Number of tranches | tranche 3 3  
Class A Common Stock | Price Based Lockup Shares      
Class of Stock [Line Items]      
Common stock, lockup shares (in shares) | shares 44,544,551 44,544,551  
Lockup shares, threshold trading days   20  
Lockup shares, threshold consecutive trading days   30  
Class A Common Stock | Time-Based Lockup Shares      
Class of Stock [Line Items]      
Common stock, lockup shares (in shares) | shares 89,449,655 89,449,655  
Lockup shares, threshold trading days   20  
Lockup shares, threshold consecutive trading days   30  
Share price (in usd per share) | $ / shares $ 12.00 $ 12.00  
Class A Common Stock | Price Based Lockup Shares, Transfer Tranche One | Price Based Lockup Shares      
Class of Stock [Line Items]      
Share price (in usd per share) | $ / shares 12.00 12.00  
Class A Common Stock | Price Based Lockup Shares, Transfer Tranche Two | Price Based Lockup Shares      
Class of Stock [Line Items]      
Share price (in usd per share) | $ / shares 14.00 14.00  
Class A Common Stock | Price Based Lockup Shares, Transfer Tranche Three | Price Based Lockup Shares      
Class of Stock [Line Items]      
Share price (in usd per share) | $ / shares 16.00 16.00  
Class A Common Stock | Earnout Shares Vesting, Tranche One      
Class of Stock [Line Items]      
Volume weighted average stock price trigger (in usd per share) | $ / shares 12.00 $ 12.00  
Earnout shares vesting, threshold trading days   20  
Earnout shares vesting, threshold consecutive trading days   30  
Class A Common Stock | Earnout Shares Vesting, Tranche Two      
Class of Stock [Line Items]      
Volume weighted average stock price trigger (in usd per share) | $ / shares $ 14.00 $ 14.00  
Earnout shares vesting, threshold trading days   20  
Earnout shares vesting, threshold consecutive trading days   30  
Class A Common Stock | Earnout Shares Vesting, Tranche Three      
Class of Stock [Line Items]      
Volume weighted average stock price trigger (in usd per share) | $ / shares   $ 16.00  
Earnout shares vesting, threshold trading days   20  
Earnout shares vesting, threshold consecutive trading days   30  
Earnout shares, term   3 years  
Class A Common Stock | OpCo      
Class of Stock [Line Items]      
Common stock subject to vesting and transfer restrictions (in shares) | shares 128,908,518 128,908,518  
Class A Common Stock | NET Power, Inc.      
Class of Stock [Line Items]      
Common stock subject to vesting and transfer restrictions (in shares) | shares 54,047,495 54,047,495  
Class B ordinary shares      
Class of Stock [Line Items]      
Common stock subject to vesting and transfer restrictions (in shares) | shares 6,072,463 6,072,463  
Class B ordinary shares | Price Based Lockup Shares      
Class of Stock [Line Items]      
Common stock, lockup shares (in shares) | shares 1,575,045 1,575,045  
Class B ordinary shares | Time-Based Lockup Shares      
Class of Stock [Line Items]      
Common stock, lockup shares (in shares) | shares 3,510,643 3,510,643  
Class B ordinary shares | OpCo      
Class of Stock [Line Items]      
Common stock subject to vesting and transfer restrictions (in shares) | shares 7,624,999 7,624,999