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Equity Incentive Plans and Stock-Based Compensation - 2014 Equity Incentive Plan/ESPP (Details) - shares |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2017 | Jun. 10, 2015 | Mar. 31, 2017 | Dec. 31, 2016
2014 Stock Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for future grant |  |  | 7,129,441 | 4,241,980
2014 Stock Incentive Plan | Prior Common Stock Outstanding |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of outstanding shares of common stock | 5.00% |  |  |
Additional shares authorized for future issuance | 3,394,376 |  |  |
2014 Stock Incentive Plan | Reallocated 2008 Equity Plan Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for reallocation |  |  | 49,000 | 266,799
2014 Stock Incentive Plan | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Additional shares reserved for future issuance |  |  |  | 8,000,000
Percentage of outstanding shares of common stock |  |  |  | 5.00%
2014 Stock Incentive Plan | Maximum | Reallocated 2008 Equity Plan Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for reallocation |  | 8,310,566 |  |
2014 Employee Stock Purchase Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares available for future grant |  |  | 4,104,060 |
Percentage of market value |  |  | 85.00% |
Percentage of eligible compensation |  |  | 15.00% |

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- Definition Employee Common Stock Purchases Through Payroll Deductions Under Employee Stock Purchase Plan Price As Percentage Of Eligible Compensation + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Shares Reserved For Future Issuance Increase Percentage + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Number of Canceled Shares Available for Reallocation + References No definition available. + Details
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- Definition Discount rate from fair value on offering date that participants pay for shares. + 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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- 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 Number of additional shares authorized for issuance under an established share-based compensation plan. + 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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- Definition The addition or reduction in the number of reserved shares that could potentially be issued under the option plan attributable to reasons other than grants, exercises, forfeitures, and expirations during the reporting period. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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