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Accounting and Reporting Policies - Additional Information (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 07, 2019 USD ($) | Dec. 31, 2019 USD ($) Customer Segment shares | Dec. 31, 2018 USD ($) Customer shares | Mar. 31, 2019 USD ($)
Accounting And Reporting Policies [Line Items] |  |  |  |
Depreciation expense |  | $ 418,000 | $ 417,000 |
Term of warranty |  | 1 year |  |
Accrued warranty expense |  | $ 29,000 | 28,000 |
Intangible assets carrying value |  | 362,000 | 437,000 |
Goodwill |  | 40,000 | 40,000 |
Research and development costs |  | 2,004,000 | 1,947,000 |
Advertising costs |  | 2,000 | 24,000 |
Revenue concentration greater than 10% |  | $ 31,897,000 | 24,870,000 |
Number of identified reportable segments | Segment |  | 2 |  |
Re-measurement gain (loss) |  | $ (13,000) | (74,000) |
Lease assets |  | 331,000 |  | $ 142,000
Lease liabilities |  | 331,000 | 58,000 | $ 142,000
Revenues [Member] | Customer Concentration Risk [Member] | Electronics Contract Manufacturer [Member] |  |  |  |
Accounting And Reporting Policies [Line Items] |  |  |  |
Revenue concentration greater than 10% |  | $ 5,522,000 | $ 4,436,000 |
Concentration risk, percentage |  | 17.30% | 17.80% |
Revenues [Member] | Customer Concentration Risk [Member] | Defense Contract Manufacturer [Member] |  |  |  |
Accounting And Reporting Policies [Line Items] |  |  |  |
Revenue concentration greater than 10% |  | $ 3,187,000 | $ 2,258,000 |
Concentration risk, percentage |  | 10.00% | 9.10% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |
Accounting And Reporting Policies [Line Items] |  |  |  |
Concentration risk, percentage |  | 40.00% | 30.00% |
Accounts receivable |  | $ 1,841,000 | $ 1,043,000 |
Number of large customers | Customer |  | 4 | 4 |
Options [Member] |  |  |  |
Accounting And Reporting Policies [Line Items] |  |  |  |
Securities excluded from the diluted earnings per share computation (in shares) | shares |  | 25,000 | 15,606 |
ASU 2014-09 [Member] |  |  |  |
Accounting And Reporting Policies [Line Items] |  |  |  |
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. |  |
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 |  |
SPAC [Member] |  |  |  |
Accounting And Reporting Policies [Line Items] |  |  |  |
Amount raised through offering | $ 172,500,000 |  |  |

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