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Stockholders' Equity - Summary of Common Shares Reserved for Future Issuance (Detail) - shares shares in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance | 44,842 | 14,660
Employee Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance | 6,085 | 3,065
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance | 960 | 1,629
Convertible Notes |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance | 30,000 | 0
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for future issuance or purchase | 879 | 1,385
Common stock warrants outstanding |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance | 1,887 | 4,118
2015 Incentive Compensation Plan | Employee Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for future issuance or purchase | 1,075 | 0
2009 Omnibus Incentive Compensation Plan | Employee Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for future issuance or purchase | 3,956 | 4,463

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- Definition Aggregate number of common shares reserved for future issuance. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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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