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Accounting And Reporting Policies - Additional Information (Details) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 USD ($) | Dec. 31, 2018 USD ($) Customer Segment shares | Dec. 31, 2017 USD ($) Customer shares
Accounting And Reporting Policies [Line Items] |  |  |
Depreciation expense |  | $ 417,000 | $ 567,000
Term of warranty |  | 1 year |
Accrued Warranty Expense |  | $ 28,000 | 10,000
Intangible assets carrying value |  | 437,000 | 512,000
Goodwill |  | 40,000 | 40,000
Research and development costs |  | 1,947,000 | 1,827,000
Advertising costs |  | 24,000 | 18,000
Deferred tax assets |  | 127,000 | 173,000
Revenue concentration greater than 10% |  | $ 24,870,000 | 22,402,000
Number of identified reportable segments | Segment |  | 2 |
Re-measurement gain (loss) |  | $ (74,000) | 22,000
Revenues [Member] | Customer Concentration Risk [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Revenue concentration greater than 10% |  | $ 4,436,000 | $ 3,744,000
Concentration risk, percentage |  | 17.80% | 16.70%
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Concentration risk, percentage |  | 30.00% | 32.00%
Accounts receivable |  | $ 1,043,000 | $ 1,100,000
Number of large customers | Customer |  | 4 | 4
Foreign NOLs [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Deferred tax assets |  | $ 127,000 |
Options [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Securities excluded from the diluted earnings per share computation (in shares) | shares |  | 15,608 | 42,676
Warrant [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Securities excluded from the diluted earnings per share computation (in shares) | shares |  |  | 519,241
ASU 2014-09 [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Cumulative effect of adoption | $ 0 |  |
Revenue, performance obligation, description of timing |  | The Company meets these conditions upon the Company’s satisfaction of the performance obligation, usually at the time of shipment to the customer, because control passes to the customer at that time. Our standard terms for customers are net due within 30 days, with a few exceptions, none regularly exceeding 60 days. |
ASU 2016-01 [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Cumulative effect adjustment from adoption of Accounting Standards Update | $ 35,000 |  |
Minimum [Member] | ASU 2014-09 [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Customer due days |  | 30 days |
Maximum [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Estimated useful life of intangible assets |  |  | 10 years
Maximum [Member] | ASU 2014-09 [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Customer due days |  | 60 days |
Buildings and Improvements [Member] | Minimum [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life |  | 5 years |
Buildings and Improvements [Member] | Maximum [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life |  | 35 years |
Other Fixed Assets [Member] | Minimum [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |
Other Fixed Assets [Member] | Maximum [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |

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