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Equity Award Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 01, 2016 | Jun. 10, 2015 | Jun. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 4,851,535 |  |  |  |  |  |
Options granted to employees and consultants |  |  |  | 672,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 3,605,000 |  |  |
Total compensation expense related to unvested awards granted, not yet recognized |  |  | $ 33.1 | $ 33.1 |  |  |
Total compensation expense related to unvested awards granted, not yet recognized weighted-average period for recognition |  |  |  | 2 years 7 months 2 days |  |  |
Share Price |  |  | $ 6.47 | $ 6.47 |  |  |
Aggregated Intrinsic Value |  |  | $ 41.1 | $ 41.1 |  |  |
Weighted Average Remaining Service Period (in years) |  |  |  | 2 years 9 months 7 days |  |  |
2014 Employee Stock Purchase Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares available for future grant |  |  | 631,718 | 631,718 |  | 542,030 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  |  | 4,000,000 |  |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  |  |  | 552,554 |  |  |
Description of automatic increase in shares reserved for future issuance |  |  |  | On the first day of each fiscal year, starting with January 1, 2015, the number of shares in the reserve will increase by the least of (i) 3,500,000 shares, (ii) 1% of the outstanding shares of our common stock on the last day of the immediately preceeding fiscal year, or (iii) such other amount as determined by our board of directors |  |  |
Purchase limit of 2014 ESPP description |  |  |  | Purchase limits of 1,500 shares during each six month purchase period or $25,000 worth of stock for each calendar year |  |  |
Offering period description |  |  |  | Each offering period will be approximately twenty-four months in duration, starting on the first trading day on or after May 21 and November 21 of each year, except for the first offering period, which commenced on March 21, 2014 and will end on the last trading day on or before May 20, 2016 |  |  |
Performance-Based |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 547,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  | 25.00% |  |  |
Stock awards |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 3,058,000 |  |  |
Market Performance-Based Restricted Stock Units |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 0 |  | 40,000 | 540,000
Share-based Compensation Arrangement by Share-based Payment Award, Consecutive Trading Days |  |  |  |  |  | 20 days |
Share-based Compensation Arrangement by Share-based Payment Award, Target Price Measurement Period |  |  |  |  |  | 4 years |
Reallocated 2008 Equity Plan Shares [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Canceled Shares Available for Reallocation |  |  |  | 189,016 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 1,640,324 |  |  |  |  |  |
2014 Employee Stock Purchase Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 642,242 |  |  |  |  |  |
Two Thousand Fourteen Stock Incentive Plan [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares available for future grant |  |  | 4,553,483 | 4,553,483 |  | 3,364,304 |
Percentage of outstanding shares of common stock | 5.00% |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 3,211,211 |  |  |  |  |  |
Options granted to employees and consultants |  |  |  | 672,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  | 3,604,561 |  |  |
Two Thousand Fourteen Stock Incentive Plan [Member] | Stock options |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Description of automatic increase in shares reserved for future issuance |  |  |  | On the first day of each fiscal year, starting with January 1, 2015, the number of shares in the reserve will increase by the least of (i) 8,000,000 shares, (ii) 5% of the outstanding shares of common stock on the last day of our immediately preceding fiscal year, or (iii) such other amount as determined by our board of directors. |  |  |
Maximum | Reallocated 2008 Equity Plan Shares [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Canceled Shares Available for Reallocation |  | 8,310,566 |  |  |  |  |
Forecast | Maximum | Two Thousand Fourteen Stock Incentive Plan [Member] |  |  |  |  |  |  |
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% |  |
Forecast | Maximum | 2014 Employee Stock Purchase Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of outstanding shares of common stock |  |  |  |  | 1.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  |  |  |  | 3,500,000 |  |

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