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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 USD ($) Country | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Schedule Of Accounting Policies [Line Items] |  |  |
Number of Countries in which Entity Operates | Country | 15 |  |
Gain (loss) from foreign currency transactions | $ 111,000 | $ (1,247,000) | $ (1,382,000)
Cash equivalents maturity, Term | Cash equivalents are high-quality short term money market instruments and commercial paper with maturities at acquisition of three months or less. |  |
Depreciation expense | $ 1,928,000 | 1,345,000 | 1,928,000
Investments | 4,073,000 | 0 |
Software development costs were capitalized | 0 | 0 | 0
Goodwill impairment | 0 | 0 | 0
Changes in cash flow from financing activities | 0 | $ 318,000 | $ 253,000
Change in Accounting Method Accounted for as Change in Estimate [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Increase in provision for income taxes | 169,000 |  |
Changes in cash flow from operating activities | (169,000) |  |
Changes in cash flow from financing activities | $ 169,000 |  |
DigiNotar B.V. [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Percentage of stock acquired by the Company | 100.00% |  |
Patents [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets | 20 years |  |
Minimum [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets | 3 years |  |
Warranty for hardware purchase | 1 year |  |
Extended product warranty period | 1 year |  |
Minimum [Member] | Software Development Costs [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated economic life of product | 2 years |  |
Minimum [Member] | Proprietary Technology [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets | 3 years |  |
Minimum [Member] | Customer Relationships [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets | 5 years |  |
Maximum [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets | 7 years |  |
Warranty for hardware purchase | 2 years |  |
Extended product warranty period | 4 years |  |
Maximum [Member] | Software Development Costs [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated economic life of product | 5 years |  |
Maximum [Member] | Proprietary Technology [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets | 7 years |  |
Maximum [Member] | Customer Relationships [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets | 12 years |  |

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