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Acquisitions - GVi Ventures, Inc. (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 12, 2017 | Dec. 09, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |
Revaluation of contingent consideration |  |  | $ (3,000) | $ (28,000) | $ (463,000)
GVi Ventures, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price | $ 5,368,000 |  |  |  |
Cash paid in purchase price | 4,069,000 |  | 1,000,000 |  |
Contingent consideration liability | 1,299,000 |  | 1,646,000 | 1,581,000 |
Contingent consideration, low range | 0 |  |  |  |
Contingent consideration, high range | $ 2,500,000 |  |  |  |
Milestone recognition period | 4 years |  |  |  |
Revaluation of contingent consideration |  |  | $ 1,065,000 | $ 282,000 |
Tax deductible goodwill | $ 443,000 |  |  |  |
Completed Technologies [Member] | GVi Ventures, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets, useful life | 5 years |  |  |  |
Customer Relationships [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets, useful life |  | 7 years |  |  |
Customer Relationships [Member] | GVi Ventures, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets, useful life | 8 years |  |  |  |

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