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Fair Value Measurements - Summary of Company's Fair Value Hierarchy for its Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Assets:    
Fair value of investments $ 32,652 $ 25,488
Money Market Funds [Member]    
Assets:    
Fair value of cash equivalents [1] 22,902 5,800
Level 1 [Member]    
Assets:    
Fair value of investments 22,902 5,800
Level 1 [Member] | Money Market Funds [Member]    
Assets:    
Fair value of cash equivalents [1] 22,902 5,800
Level 2 [Member]    
Assets:    
Fair value of investments 9,750 19,688
Level 2 [Member] | Money Market Funds [Member]    
Assets:    
Fair value of cash equivalents [1] 0 0
Marketable Investments [Member]    
Assets:    
Fair value of cash equivalents [2] 9,750 19,688
Marketable Investments [Member] | Level 1 [Member]    
Assets:    
Fair value of cash equivalents [2] 0 0
Marketable Investments [Member] | Level 2 [Member]    
Assets:    
Fair value of cash equivalents [2] $ 9,750 $ 19,688
[1] Included in cash and cash equivalents in the Consolidated Balance Sheets.
[2] Marketable investments have been initially valued at the transaction price and subsequently valued, at the end of the reporting period, utilizing third party pricing services or other market observable data. The pricing services utilize industry standard valuation methods, including both income and market-based approaches and observable market inputs to determine value. These observable market inputs include reportable trades, benchmark yields, credit spreads, broker/dealer quotes, bids, offers, current spot rates and other industry and economic events.