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Acquisition - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 23, 2018 | Dec. 31, 2018
Business Acquisition [Line Items] |  |
Business acquisition, fair value of common stock |  | $ 6,846
Alert Labs Inc |  |
Business Acquisition [Line Items] |  |
Business acquisition, cash consideration | $ 5,889 |
Business acquisition, fair value of common stock | 3,991 |
Adjustment related to previously held equity interest | 171 |
Contingent consideration | $ 3,026 |
Contingent consideration performance measurement period | 3 years |
Intangibles and goodwill acquired | $ 14,941 |
Fair value of intangible assets | 1,640 |
Alert Labs Inc | Patented And Unpatented Technology [Member] |  |
Business Acquisition [Line Items] |  |
Fair value of intangible assets | 1,600 |
Alert Labs Inc | Customer Relationships [Member] |  |
Business Acquisition [Line Items] |  |
Fair value of intangible assets | $ 40 |
Stock consideration [Member] | Alert Labs Inc |  |
Business Acquisition [Line Items] |  |
Business acquisition, issuance of shares of common stock | 23,873 |
Contingent consideration [Member] | Alert Labs Inc |  |
Business Acquisition [Line Items] |  |
Common stock shares issued | 23,230 |

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