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Nature of Organization and Operations - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
	Jan. 13, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Nature Of Organization And Operations [Line Items]
Proceeds from follow-on public offering after deducting underwriting discounts and commissions		$ 381,593	$ 109,927
Cash and cash equivalents		417,881	$ 288,247	$ 351,985
Marketable securities		$ 228,813
Follow-on Public Offerings [Member]
Nature Of Organization And Operations [Line Items]
Issuance of common stock in follow-on offering, shares	10,925
Price of common stock	$ 37.00
Proceeds from follow-on public offering after deducting underwriting discounts and commissions	$ 381,500
Underwriting discounts and commissions	22,200
Offering Cost	$ 500
Over Allotment Option [Member]
Nature Of Organization And Operations [Line Items]
Issuance of common stock in follow-on offering, shares	1,425
Price of common stock	$ 37.00

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