Stockholders' Equity - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended
	Oct. 31, 2019	Jun. 30, 2014	Mar. 31, 2020	Mar. 31, 2019
Class Of Stock [Line Items]
Proceeds from issuance of common stock	$ 162,200,000
Shares of common stock issued pursuant to exercise of stock options			70,000
Proceeds from stock option exercises			$ 504,000	$ 6,539,000
Total unrecognized compensation cost related to non-vested, stock-based payment awards			$ 114,700,000
Total unrecognized compensation cost, expect to recognize over weighted average period			2 years 10 months 24 days
Pre-funded Warrants
Class Of Stock [Line Items]
Class of warrant or right, number of securities called by warrants or rights		600,000
Class of warrant or right, exercise price of warrants or rights		$ 0.01
Class of warrant or right, expiration date		Jun. 30, 2021
Class of warrant or right, exercised during period			267,870
Proceeds from issuance of warrants			$ 2,679
Class of warrant or right, outstanding			195,574
Common Stock
Class Of Stock [Line Items]
Number of shares issued	9,900,000
Share price	$ 17.50
Payments of stock issuance costs	$ 10,300,000
Issuance of common stock on exercise of warrants (in shares)			268,000
Shares of common stock issued pursuant to exercise of stock options			70,000	732,000
Common Stock | Pre-funded Warrants
Class Of Stock [Line Items]
Issuance of common stock on exercise of warrants (in shares)			267,870