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Acquisitions (Details) - USD ($) | Apr. 12, 2017 | Apr. 04, 2017 | Oct. 01, 2017
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ViDi Systems S.A. |  |  |
Business Acquisition [Line Items] |  |  |
Total purchase price |  | $ 23,015,000 |
Cash payment |  | 20,019,000 |
Holdback to secure potential claims under agreement |  | $ 2,996,000 |
Holdback limitation period |  | 18 months |
tax deductible goodwill |  | $ 5,112,000 |
ViDi Systems S.A. | Completed technologies |  |  |
Business Acquisition [Line Items] |  |  |
Amortization period |  | 6 years |
ViDi Systems S.A. | Non-compete agreement |  |  |
Business Acquisition [Line Items] |  |  |
Amortization period |  | 3 years |
GVi Ventures, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Total purchase price | $ 5,368,000 |  |
Cash payment | 4,069,000 |  |
Contingent consideration liabilities | 1,299,000 |  | $ 1,477,000
Contingent consideration, low range | 0 |  |
Contingent consideration, high range | $ 3,500,000 |  |
Contingent consideration, period of recognition (in years) | 5 years |  |
Contingent consideration, current |  |  | 311,000
Contingent consideration, noncurrent |  |  | $ 1,166,000
GVi Ventures, Inc. | Completed technologies |  |  |
Business Acquisition [Line Items] |  |  |
Amortization period | 5 years |  |
GVi Ventures, Inc. | Customer relationships |  |  |
Business Acquisition [Line Items] |  |  |
Amortization period | 8 years |  |

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