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Employee Savings Plan and Employee Stock Purchase Plan - Additional Information (Detail) - USD ($)		12 Months Ended
	May. 05, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Contribution Plan Disclosure [Line Items]
401(k) eligibility minimum service period		90 days
401(k) description of plan contributions		Contribution equal to 100% of the first 1% of salary deferrals and 50% of salary deferrals between 2% and 6%, up to a maximum matching contribution of 3.5% of salary each plan year for our employees.
Employee vested percentage in salary deferrals and roll over contributions		100.00%
Minimum period for vesting 100% contributions		2 years
Minimum period for vesting of discretionary contributions		2 years
Matching contribution amount		$ 2,400,000	$ 1,700,000	$ 1,200,000
Employee Stock Purchase Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Employees Company's common stock shares purchase limit percentage	10.00%
Maximum number of shares that may be acquired by a participant		2,000
Share of common stock purchase maximum		2,000,000
Purchase of shares of common stock		44,034
Compensation expense related to ESPP		$ 400,000	$ 0	$ 0
After Two Years Of Employment [Member]
Defined Contribution Plan Disclosure [Line Items]
Matching contributions, vesting percentage		100.00%
One Hundred Percent Match For Percent Of Participants Contribution [Member]
Defined Contribution Plan Disclosure [Line Items]
Employer contribution percentage		100.00%
Percentage of salary deferrals		1.00%
50% Matching Contribution [Member]
Defined Contribution Plan Disclosure [Line Items]
Employer contribution percentage		50.00%
Minimum [Member]
Defined Contribution Plan Disclosure [Line Items]
401(k) eligible age of employee		21 years
Minimum [Member] | 50% Matching Contribution [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of salary deferrals		2.00%
Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of salary deferrals		3.50%
Maximum [Member] | Employee Stock Purchase Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Purchase price of common stock expressed as a percentage of its fair market value	85.00%
Maximum [Member] | 50% Matching Contribution [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of salary deferrals		6.00%

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Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Purchase Maximum

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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