Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Non-marketable equity securities	$ 0		$ 0
Remeasurements or impairment losses on non-marketable equity securities	$ 0	$ 0