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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended				6 Months Ended
	Jun. 30, 2018	Apr. 30, 2018	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Class Of Stock [Line Items]
Proceeds from issuance of common stock	$ 194,400	$ 168,700
Shares of common stock issued pursuant to exercise of stock options							1,542,000
Proceeds from stock option exercises							$ 16,215	$ 10,641
Total unrecognized compensation cost related to non-vested, stock-based payment awards			$ 84,500				$ 84,500
Total unrecognized compensation cost, expect to recognize over weighted average period							2 years 6 months
Common Stock
Class Of Stock [Line Items]
Number of shares issued	5,100,000	6,900,000			11,963,000
Share price	$ 39.50	$ 26.00			$ 39.50			$ 39.50
Payments of stock issuance costs	$ 5,600	$ 10,700
Shares of common stock issued pursuant to exercise of stock options			810,000	732,000	504,000	435,000

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