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Equity Plans and Stock-Based Compensation - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 30, 2019 | May 28, 2014 | May 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Outstanding stock awards granted |  |  |  | 8,418,000 |  | 8,418,000 |  | 5,750,000
Increase in aggregate number of shares of common stock authorized for issuance |  |  | 600,000 |  |  |  |  |
Stock-based compensation expense |  |  |  | $ 9,349,000 | $ 6,290,000 | $ 15,519,000 | $ 11,089,000 |
Restructuring |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  | 4,122,000 |  | 4,122,000 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Aggregate intrinsic value |  |  |  | $ 10,100,000 |  | $ 10,100,000 |  |
Restricted stock unit awards outstanding |  |  |  | 2,531,000 |  | 2,531,000 |  | 1,594,000
Employee Stock Option |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Outstanding stock awards granted |  |  |  | 151,000 |  | 151,000 |  |
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 |  |  |  | 191,000 |  | 191,000 |  |
Stock-based compensation expense |  |  |  | $ 28,000 |  | $ 300,000 |  |
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 |  |  |  |  |
Outstanding stock awards granted |  |  | 7,477,619 |  |  |  |  |
Shares reserved and approved for issuance |  |  |  | 12,617,869 |  | 12,617,869 |  |
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 |  |  |  | $ 35,600,000 |  | $ 35,600,000 |  |
Total unrecognized compensation cost, weighted-average vesting period |  |  |  |  |  | 1 year 10 months 24 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 |  |  |  | $ 1,700,000 |  | $ 1,700,000 |  |
2014 Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued to employees |  |  |  |  |  | 74,562 |  |
Shares remaining available for future purchases |  |  |  | 498,472 |  | 498,472 |  |
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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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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