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The Company and Subsequent Events - Summary of Reconciliation of Beginning and Ending Restructuring Liability (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Restructuring Cost And Reserve [Line Items] |  |
Balance, beginning of period | $ 2,547 |
Additions, charged to restructuring expenses | 1,914 | $ 865
Payments | (3,103) |
Balance, end of period | 1,358 |
One-Time Employee Termination Benefit Costs |  |
Restructuring Cost And Reserve [Line Items] |  |
Balance, beginning of period | 2,079 |
Additions, charged to restructuring expenses | 646 |
Payments | (1,675) |
Balance, end of period | 1,050 |
Contract Termination Costs |  |
Restructuring Cost And Reserve [Line Items] |  |
Balance, beginning of period | 389 |
Additions, charged to restructuring expenses | 4 |
Payments | (88) |
Balance, end of period | 305 |
Consulting Costs |  |
Restructuring Cost And Reserve [Line Items] |  |
Balance, beginning of period | 79 |
Additions, charged to restructuring expenses | 839 |
Payments | (915) |
Balance, end of period | 3 |
Asset Disposal Costs |  |
Restructuring Cost And Reserve [Line Items] |  |
Additions, charged to restructuring expenses | 425 |
Payments | $ (425) |

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