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Equity Plans and Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
May 30, 2019 | May 28, 2014 | May 31, 2018 | Sep. 30, 2019 | Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Increase in aggregate number of shares of common stock authorized for issuance |  |  | 600,000 |  |
Outstanding stock awards granted |  |  |  | 7,997,000 | 5,750,000
Restructuring |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 4,122 |
Restricted Stock Units (RSUs) |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Aggregate intrinsic value |  |  |  | $ 7,400 |
Restricted stock unit awards outstanding |  |  |  | 2,068,000 | 1,594,000
Employee Stock Option |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Outstanding stock awards granted |  |  |  | 155,000 |
Employee Stock Option | Minimum |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Options vesting period |  |  |  | 3 years |
Expiration period |  |  |  | 7 years |
Employee Stock Option | Maximum |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Options vesting period |  |  |  | 4 years |
Expiration period |  |  |  | 10 years |
Performance Based Vesting Condition |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Restricted stock unit awards outstanding |  |  |  | 111,000 |
2018 Equity Incentive Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Newly reserved shares of common stock |  |  | 5,000,000 |  |
Shares remaining available for future purchases |  |  | 140,250 |  |
Shares reserved and approved for issuance |  |  |  | 12,617,869 |
2011 Equity Incentive Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares remaining available for future purchases |  |  | 7,477,619 |  |
Amended 2018 Equity Incentive Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Increase in aggregate number of shares of common stock authorized for issuance | 2,300,000 |  |  |  |
Shares reserved and approved for issuance | 14,917,869 |  |  |  |
Time Based Vesting Schedule |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Total unrecognized compensation cost related to non-vested equity awards |  |  |  | $ 30,500 |
Total unrecognized compensation cost, weighted-average vesting period |  |  |  | 1 year 7 months 6 days |
Performance Based Vesting Schedule |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Total unrecognized compensation cost related to non-vested equity awards |  |  |  | $ 400 |
2014 Employee Stock Purchase Plan |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares issued to employees |  |  |  | 122,117 |
Shares remaining available for future purchases |  |  |  | 450,917 |
2014 Employee Stock Purchase Plan | The commencement of the offer period (generally, the sixteenth day in February or August) |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Purchase price per share as percentage of fair market value of common stock |  | 85.00% |  |  |
2014 Employee Stock Purchase Plan | The exercise date, which is the last day of a purchase period (generally, the fifteenth day in February or August) |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Purchase price per share as percentage of fair market value of common stock |  | 85.00% |  |  |

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