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Stockholders' Equity - Common Stock Reserved for Future Issuance (Details) - shares | Dec. 31, 2017 | Apr. 03, 2014
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Class of Stock [Line Items] |  |
Shares of common stock reserved for future issuance (in shares) | 14,764,000 |
2014 Equity Incentive Plan |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved for future issuance (in shares) | 7,300,000 |
Employee Stock Options |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved for future issuance (in shares) | 4,047,000 |
Restricted Stock Units |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved for future issuance (in shares) | 2,033,000 |
ESPP |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved for future issuance (in shares) | 1,371,000 | 880,000
Common stock warrants |  |
Class of Stock [Line Items] |  |
Shares of common stock reserved for future issuance (in shares) | 13,000 |

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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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