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Stock Incentive Plans - Additional Information (Details) | 1 Months Ended | 9 Months Ended | 12 Months Ended
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Oct. 31, 2016 shares | Sep. 30, 2017 Period $ / shares shares | Sep. 30, 2016 $ / shares | Dec. 31, 2016 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Options granted during the period |  | 449,556 |  | 361,385
Shares available for future issuance |  | 8,121,448 |  | 7,526,060
Estimated weighted-average grant date fair value of common stock underlying options granted | $ / shares |  | $ 18.50 | $ 5.78 |
2006 Equity Incentive Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock option plan, description |  | Options under the Plan were granted for periods of up to ten years and at the fair value of the shares on the date of grant as determined by the board of directors. |  |
Stock option vesting term |  | 3 years |  |
2006 Equity Incentive Plan | First Anniversary of Grant |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock option exercisable rate, Percentage |  | 25.00% |  |
2006 Equity Incentive Plan | Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock option, period for grant |  | 10 years |  |
2006 Equity Incentive Plan | Minimum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Percentage of voting power of all classes of stock |  | 10.00% |  |
2006 Equity Incentive Plan | ISO | Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock option vesting term |  | 5 years |  |
2006 Equity Incentive Plan | Other Options | Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock option vesting term |  | 10 years |  |
2016 Plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock option plan, description |  | On the first day of each year beginning with 2017, the 2016 Plan authorizes an annual increase of the least of 3,865,000 shares, 5% of outstanding common stock on the last day of the immediately preceding fiscal year or an amount as determined by the Company's Board of Directors. |  |
Effective date | Oct. 19, 2016 |  |  |
Options granted during the period | 0 |  |  |
Shares available for future issuance | 3,865,000 | 4,971,966 |  |
Percentage of outstanding common stock increased annually under the plan | 5.00% |  |  |
2016 Plan | Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Stock option, period for grant |  | 10 years |  |
2016 Plan | Minimum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Percentage of stock option exercise price of fair market value of common stock | 100.00% |  |  |
Employee Stock Purchase Program (“ESPP”) |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Effective date | Oct. 19, 2016 |  |  |
Shares available for future issuance | 483,031 | 709,993 |  |
Percentage of outstanding common stock increased annually under the plan | 1.50% |  |  |
Increase in shares available for future issuance | 966,062 |  |  |
Offering period |  | 12 months |  |
Number of purchase period | Period |  | 2 |  |
Purchase period |  | 6 months |  |
Percentage of employee purchase shares of fair market value | 85.00% |  |  |
Common stock issued to employees |  | 105,128 |  |
Employee Stock Purchase Program (“ESPP”) | Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Percentage of payroll deductions of eligible compensation | 15.00% |  |  |

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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + 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 (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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