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Acquisitions - Summary of Allocation of Purchase Price (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 19, 2016 | Apr. 07, 2016
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 3,685 | $ 3,686 |  |
Total assets |  | 5,843 |  |
Total liabilities |  | $ 1,525 |  |
Birdstep Technology AB [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents |  |  |  | $ 73
Accounts receivable |  |  |  | 99
Income tax receivable |  |  |  | 103
Prepaids and other current assets |  |  |  | 311
Equipment and improvements |  |  |  | 30
Intangible assets |  |  |  | 670
Goodwill |  |  |  | 1,991
Total assets |  |  |  | 3,277
Accounts payable |  |  |  | 223
Accrued liabilities |  |  |  | 421
Deferred revenue |  |  |  | 486
Deferred tax liability |  |  |  | 147
Total liabilities |  |  |  | 1,277
Total purchase price |  |  |  | $ 2,000
iMobileMagic - Mobile Experiences LDA [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and cash equivalents |  |  | $ 23 |
Short term investments |  |  | 1 |
Accounts receivable |  |  | 156 |
Prepaids and other current assets |  |  | 8 |
Intangible assets |  |  | 683 |
Goodwill |  |  | 1,695 |
Total assets |  |  | 2,566 |
Accounts payable |  |  | 13 |
Accrued liabilities |  |  | 64 |
Deferred tax liability |  |  | 171 |
Total liabilities |  |  | 248 |
Total purchase price |  |  | $ 2,318 |

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