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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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- Definition Defined contribution plan contributions by employer vesting period. + References No definition available. + Details
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- Definition Defined contribution plan employees minimum period of service. + References No definition available. + Details
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- Definition Defined contribution plan employers discretionary contribution vesting percentage. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Defined Contribution Plan -URI http://asc.fasb.org/extlink&oid=49180617 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares purchased on the open market during the period for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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