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Summary of Significant Accounting Polices - Additional Information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) Segment Customer shares | Dec. 31, 2019 USD ($) Customer shares
Accounting And Reporting Policies [Line Items] |  |  |
Depreciation expense |  | $ 453,000 | $ 418,000
Intangible assets carrying value |  | 287,000 | 362,000
Goodwill |  | $ 40,000 | 40,000
Term of warranty |  | 1 year |
Accrued warranty expense |  | $ 21,000 | 29,000
Research and development costs |  | $ 2,142,000 | 2,004,000
Warrants to purchase, common stock | shares |  | 1,051,664 |
Deferred tax asset, valuation allowance eliminated | $ (3,344,000,000) |  | (3,344,000,000)
Revenue concentration greater than 10% |  | $ 31,162,000 | 31,897,000
Number of identified reportable segments | Segment |  | 2 |
Re-measurement gain (loss) |  | $ (95,000) | (13,000)
Revenues [Member] | Customer Concentration Risk [Member] | Defense Contract Manufacturer [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Revenue concentration greater than 10% |  | $ 5,324,000 | $ 3,187,000
Concentration risk, percentage |  | 17.10% | 10.00%
Revenues [Member] | Customer Concentration Risk [Member] | Electronics Contract Manufacturer [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Revenue concentration greater than 10% |  | $ 4,351,000 | $ 5,522,000
Concentration risk, percentage |  | 14.00% | 17.30%
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Concentration risk, percentage |  | 43.10% | 40.00%
Accounts receivable |  | $ 1,856,000 | $ 1,841,000
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 | 25,000
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] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Equity method investment ownership percentage |  | 20.00% |
Minimum [Member] | ASU 2014-09 [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Customer due days |  | 30 days |
Minimum [Member] | Buildings and Improvements [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life |  | 5 years |
Minimum [Member] | Other Fixed Assets [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |
Maximum [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Equity method investment ownership percentage |  | 50.00% |
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 |
Maximum [Member] | Buildings and Improvements [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life |  | 35 years |
Maximum [Member] | Other Fixed Assets [Member] |  |  |
Accounting And Reporting Policies [Line Items] |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |

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