Financial Instruments - Summary of Changes in Fair Value of the Company's Liability for Contingent Consideration (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Contingent Consideration Liability [Roll Forward]
Liability at the beginning of the period	$ 978
Change in fair value of contingent consideration	0	$ 22
Liability at end of the period	$ 978