Basis of Presentation and Summary of Significant Accounting Policies - Summary of Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. Treasury Bills	$ 45,299	$ 49,938
Total assets at fair value	64,995	82,048
Money Market Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market accounts and funds	19,696	32,110
Quoted prices in active markets for identical assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. Treasury Bills	45,299	49,938
Total assets at fair value	64,995	82,048
Quoted prices in active markets for identical assets (Level 1) \| Money Market Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market accounts and funds	19,696	32,110
Significant other observable inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. Treasury Bills	0	0
Total assets at fair value	0	0
Significant other observable inputs (Level 2) \| Money Market Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market accounts and funds	0	0
Significant other unobservable inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. Treasury Bills	0	0
Total assets at fair value	0	0
Loan payable, net of current portion	43,100
Significant other unobservable inputs (Level 3) \| Money Market Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Money market accounts and funds	$ 0	$ 0

G1 Therapeutics, Inc. 10-Q