v3.8.0.1

STOCKHOLDERS' EQUITY - Common Stock Reserved for Future Issuance (Details) - shares | Sep. 30, 2017 | Dec. 31, 2016
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Class of Stock [Line Items] |  |
Total reserved shares of common stock for future issuance | 18,740,132 |
Employee Stock Options and Restricted Stock Units |  |
Class of Stock [Line Items] |  |
Options and Restricted Stock Units issued and outstanding | 9,254,272 |
2014 Equity Incentive Plan |  |
Class of Stock [Line Items] |  |
Shares reserved for issuance under share-based compensation plan | 7,473,429 | 5,116,753
Employee Stock Purchase Plan |  |
Class of Stock [Line Items] |  |
Shares reserved for issuance under share-based compensation plan | 2,012,431 |

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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 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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