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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 26, 2018 | Mar. 15, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Loss Contingencies [Line Items] |  |  |  |
Rental expense under operating leases |  |  | $ 2,100 | $ 2,700
Payment of tariffs to be made from unfavorable ruling |  |  | 3,700 |
Amount award to other party | $ 1,000 |  |  |
Stock issued during period, litigation settlement (in shares) | 500,000 |  |  |
Additional amount awarded to other party, within 12 months | $ 1,000 |  |  |
Additional amount awarded to other party, within 24 months | $ 1,000 |  |  |
Extinguishment of acquisition-related liabilities |  |  | 17,174 | $ 0
Contingent consideration, liability, current |  |  | 1,000 |
Contingent consideration, liability, noncurrent |  |  | $ 1,000 |
Former stockholders of RER |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Stock issued during period, shares, acquisitions (in shares) |  | 973,333 |  |

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