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Equity Incentive Plans and Stock-Based Compensation - 2014 Equity Incentive Plan/ESPP (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2017 | Jun. 10, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares available for future grant (in shares) |  |  | 112,431 |  |
2014 Stock Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares available for future grant (in shares) |  |  | 6,071,997 |  | 4,241,980
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 (in shares) |  |  | 112,431 |  | 266,799
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 (in shares) | 3,394,376 |  |  |  |
2014 Stock Incentive Plan | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Additional shares reserved for future issuance (in shares) |  |  |  |  | 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 (in shares) |  | 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 (in shares) |  |  | 3,579,959 |  |
Percentage of market value |  |  | 85.00% |  |
Percentage of eligible compensation |  |  | 15.00% |  |
2014 Employee Stock Purchase Plan | Employee stock purchase rights |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
ESPP shares purchased during period (in shares) |  |  | 524,101 | 552,554 |
ESPP shares purchased during period (in dollars per share) |  |  | $ 6.49 | $ 3.88 |
Intrinsic value of ESPP shares purchased |  |  | $ 0.9 | $ 1.3 |

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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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