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Acquisitions - Additional Information (Detail) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 19, 2016 USD ($) Employee | Apr. 07, 2016 USD ($) | Dec. 31, 2017 | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |
Total purchase price |  |  |  | $ 4,318
Total cash consideration |  |  |  | 2,485
Birdstep Technology AB [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition agreement date |  |  | Mar. 08, 2016 |
Business acquisition, equity interests acquired |  | 100.00% |  |
Total purchase price |  | $ 2,000 |  |
Birdstep Technology AB [Member] | General and Administrative [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition-related costs |  |  |  | 200
iMobileMagic - Mobile Experiences LDA [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition agreement date |  |  | Jul. 19, 2016 |
Business acquisition, equity interests acquired | 100.00% |  |  |
Acquisition-related costs |  |  |  | $ 200
Purchase price in cash | $ 2,300 |  |  |
Total cash consideration | 600 |  |  |
Buyers common stock initial shares | 600 |  |  |
Buyers common stock in escrow | $ 1,100 |  |  |
Number of employees | Employee | 16 |  |  |

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