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Equity - Incentive Equity Awards - Additional Information (Detail) - USD ($) $ in Thousands							1 Months Ended	6 Months Ended
	May 20, 2019	Feb. 01, 2019	Nov. 01, 2018	May 14, 2018	Mar. 12, 2018	Feb. 01, 2018	Sep. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stockholders Equity Note [Line Items]
Stock options, outstanding								16,585,065
Shares issued, exercise of stock options								4,458,143	956,232
Proceeds from exercise of stock options, net of transaction costs								$ 17,344	$ 1,826
Restricted Stock Units (RSUs)
Stockholders Equity Note [Line Items]
Restricted stock units, outstanding								9,314,621
Percentage of outstanding shares on a fully diluted basis								2.00%
Restricted Stock Units (RSUs) | Stock Incentive Plan 2011
Stockholders Equity Note [Line Items]
Stock units, Granted	45,163	757,800		190,034		1,305,575
Stock units, Vesting Period	3 years	3 years		3 years		3 years
Stock units, additional granted	20,000
Restricted Stock Units (RSUs) | Stock Incentive Plan 2011 | Vesting Period
Stockholders Equity Note [Line Items]
Stock units, Granted			90,000		970,000
Stock units, Vesting Period					3 years
Restricted Stock Units (RSUs) | Stock Incentive Plan 2011 | Vest over a three year period
Stockholders Equity Note [Line Items]
Shares issued, related to the vesting of RSUs								387,715
Treasury shares for settlement of employee tax obligations								139,928
Restricted Stock Units (RSUs) | Stock Incentive Plan 2011 | Employees
Stockholders Equity Note [Line Items]
Stock units, Granted		580,000
Stock Options
Stockholders Equity Note [Line Items]
Percentage of outstanding shares on a fully diluted basis								4.00%
Stock Options | Stock Incentive Plan 2011
Stockholders Equity Note [Line Items]
Stock options, Granted	58,721	1,193,400		286,536		2,205,075
Stock units, Vesting Period		4 years				4 years
Performance-Based RSUs
Stockholders Equity Note [Line Items]
Shares issued, related to the vesting of RSUs							2,499,750
Treasury shares for settlement of employee tax obligations							764,819

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