Fair value measurements - Recorded Amount of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets:
Marketable securities	$ 0	$ 68,735
Corporate bonds
Assets:
Marketable securities		2,498
Fair value, measurements, recurring
Assets:
Cash and cash equivalents	221,755	113,006
Beneficiary interest in factored invoices	560
Total assets	222,315	181,741
Fair value, measurements, recurring | U.S. government agency securities and treasuries
Assets:
Marketable securities	0	66,237
Fair value, measurements, recurring | Corporate bonds
Assets:
Marketable securities		2,498
Fair value, measurements, recurring | Quoted prices in active markets (Level 1)
Assets:
Cash and cash equivalents	221,755	113,006
Beneficiary interest in factored invoices	0
Total assets	221,755	113,006
Fair value, measurements, recurring | Quoted prices in active markets (Level 1) | U.S. government agency securities and treasuries
Assets:
Marketable securities	0	0
Fair value, measurements, recurring | Quoted prices in active markets (Level 1) | Corporate bonds
Assets:
Marketable securities		0
Fair value, measurements, recurring | Significant other observable inputs (Level 2)
Assets:
Cash and cash equivalents	0	0
Beneficiary interest in factored invoices	0
Total assets	0	68,735
Fair value, measurements, recurring | Significant other observable inputs (Level 2) | U.S. government agency securities and treasuries
Assets:
Marketable securities	0	66,237
Fair value, measurements, recurring | Significant other observable inputs (Level 2) | Corporate bonds
Assets:
Marketable securities		2,498
Fair value, measurements, recurring | Significant unobservable inputs (Level 3)
Assets:
Cash and cash equivalents	0	0
Beneficiary interest in factored invoices	560
Total assets	560	0
Fair value, measurements, recurring | Significant unobservable inputs (Level 3) | U.S. government agency securities and treasuries
Assets:
Marketable securities	$ 0	0
Fair value, measurements, recurring | Significant unobservable inputs (Level 3) | Corporate bonds
Assets:
Marketable securities		$ 0