Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Financial instruments transferred among fair value hierarchy levels	$ 0
Cash equivalents included of available-for-sale securities	103,300,000	$ 15,000,000.0
Available for sale securities with contractual maturities of three months to one year.	220,900,000	279,700,000
Available for sale securities with contractual maturities greater than one year	$ 32,100,000	$ 39,400,000