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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 08, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Accumulated deficit |  | $ 619.2 |  | $ 619.2 |  | $ 671.8
Cash, cash equivalents and short-term investments |  | 668.7 |  | 668.7 |  |
Working capital |  | 720.2 |  | 720.2 |  |
Share-based compensation expense |  | 27.1 | $ 25.4 | 77.3 | $ 81.3 |
Estimated share-based compensation related to unvested stock units |  | 150.1 |  | $ 150.1 |  |
Sales returns coverage period |  |  |  | 30 days |  |
Accrued healthcare obligations |  | $ 2.3 |  | $ 2.3 |  |
Performance Shares |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Performance restricted stock units granted | 43,370 |  |  |  |  |
Vesting period of performance restricted stock units |  |  |  | 3 years |  |
Performance Shares | Minimum |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Vesting percentage of performance restricted stock units | 0.00% |  |  |  |  |
Performance Shares | Maximum |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Vesting percentage of performance restricted stock units | 200.00% |  |  |  |  |
Share-based compansation expense of performance restricted stock units | $ 4.5 |  |  |  |  |

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- Definition Revenue Recognition, Sales Returns, Coverage Period + References No definition available. + Details
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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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