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Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended |
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Dec. 31, 2017 USD ($) Customers | Dec. 31, 2016 USD ($) Customers | Dec. 31, 2015 USD ($) | Dec. 31, 2017 SEK | Dec. 31, 2017 TWD | Dec. 31, 2017 KPW | Dec. 31, 2017 JPY (¥)
Summary of Significant Accounting Policies (Textual) |  |  |  |  |  |  |
Noncontrolling interest owned by Pronode Technologies AB | 51.00% |  |  | 51.00% | 51.00% | 51.00% | 51.00%
Noncontrolling interest owned by Propoint AB | 49.00% |  |  | 49.00% | 49.00% | 49.00% | 49.00%
Finished goods | $ 759,000 | $ 132,000 |  |  |  |  |
Research and development | 6,078,000 | 7,069,000 | $ 6,279,000 |  |  |  |
Basic deposit coverage limits per owner and customer | 100,000 |  |  | SEK 100,000 | TWD 3,000,000 | KPW 50,000,000 | ¥ 10,000,000
Allowance for doubtful accounts | 149,000 | 149,000 |  |  |  |  |
Costs capitalized in projects in process | 1,000 |  |  |  |  |  |
Foreign currency translation included in general and administrative expense | 84,000 | 74,000 | 62,000 |  |  |  |
Foreign currency translation adjustments | 72,000 | (217,000) | (103,000) |  |  |  |
Cost of sales |  |  | 165,000 |  |  |  |
Advertising costs | $ 602,000 | 299,000 | $ 328,000 |  |  |  |
Noncontrolling interest, Description | Noncontrolling interests' partners have less than 50% share of voting rights at any one of the subsidiary level companies. |  |  |  |  |  |
Future sales returns | $ 200,000 |  |  |  |  |  |
Investment in joint venture | $ 3,000 | $ 3,000 |  |  |  |  |
Income tax, description | The one-time mandatory transition tax on accumulated foreign earnings and a reduction of the corporate income tax rate from 35% to 21% effective January 1, 2018, among other changes. |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textual) |  |  |  |  |  |  |
Concentration risk, percentage | 20.00% |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textual) |  |  |  |  |  |  |
Concentration risk, percentage | 50.00% |  |  |  |  |  |
Accounts Receivable [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textual) |  |  |  |  |  |  |
Concentration risk, percentage | 69.00% | 59.00% |  |  |  |  |
Number of customers | Customers | 2 | 3 |  |  |  |  |
Sales Revenue, Net [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textual) |  |  |  |  |  |  |
Concentration risk, percentage | 10.00% | 10.00% | 10.00% |  |  |  |
Hewlett Packard [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textual) |  |  |  |  |  |  |
Concentration risk, percentage | 28.00% | 38.00% | 25.00% |  |  |  |
Canon [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textual) |  |  |  |  |  |  |
Concentration risk, percentage | 17.00% |  |  |  |  |  |
Bosch [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textual) |  |  |  |  |  |  |
Concentration risk, percentage | 10.00% |  |  |  |  |  |
Amazon Inc [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textual) |  |  |  |  |  |  |
Concentration risk, percentage |  | 11.00% | 14.00% |  |  |  |
Autoliv [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textual) |  |  |  |  |  |  |
Concentration risk, percentage |  | 11.00% | 21.00% |  |  |  |
AirBar sales [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textual) |  |  |  |  |  |  |
Finished goods | $ 1,100,000 |  |  |  |  |  |
Research and development | 1,100,000 |  |  |  |  |  |
Cost of sales | 100,000 |  |  |  |  |  |
Revalue of purchase price | 0.12 |  |  |  |  |  |
Write off related product development units | 500,000 |  |  |  |  |  |
United States [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textual) |  |  |  |  |  |  |
Net assets (liabilities) | 2,373,000 | $ 2,189,000 |  |  |  |  |
Europe [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textual) |  |  |  |  |  |  |
Net assets (liabilities) | 5,418,000 | 1,872,000 |  |  |  |  |
Asia [Member] |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Textual) |  |  |  |  |  |  |
Net assets (liabilities) | $ 72,000 | $ 74,000 |  |  |  |  |

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