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Stockholders' Equity - Summary of Common Shares Reserved for Future Issuance (Detail) - shares | Dec. 31, 2018 | Dec. 31, 2017
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance (in shares) | 61,708,149 | 56,805,733
Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance (in shares) | 8,796,212 | 6,566,483
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance (in shares) | 454,382 | 1,055,977
Convertible Notes |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance (in shares) | 40,649,225 | 40,649,225
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for future issuance or purchase (in shares) | 825,537 | 857,638
Common stock warrants outstanding |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance (in shares) | 5,815,283 | 1,886,630
2015 Incentive Compensation Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for future issuance or purchase (in shares) | 1,943,085 | 1,973,537
2018 Omnibus Incentive Compensation Plan | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for future issuance or purchase (in shares) | 3,224,425 | 3,816,243

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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