Revenue from Contracts with Customers - Summary of Revenue Recognized on Various Performance Obligations and Elected Accounting Expedients (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenue related to deferred revenue balance at beginning of period	$ 22,450	$ 25,901	$ 36,151	$ 38,801	$ 36,770	$ 29,401
Revenue related to new performance obligations satisfied during the period	59,228	55,990	45,306	41,013	41,814	47,263
Revenue recognized under "right-to-invoice" expedient	70,127	68,877	61,114	64,531	62,105	56,811
Reimbursed travel expenses, shipping and other revenue	117	130	101	323	517	177
Total revenue	$ 151,922	$ 150,898	$ 142,672	$ 144,668	$ 141,206	$ 133,652	$ 445,492	$ 419,526