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Organization and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Disaggregated Net Sales

The following table shows the Company’s disaggregated net sales by product type:

 

    Years Ended December 31,  
    2020     2019  
DC power systems   $ 8,659     $ 24,177  
Engineering & Tech Support Services     226       281  
Accessories     146       343  
Total net sales   $ 9,031     $ 24,801  

 

The following table shows the Company’s disaggregated net sales by customer type:

 

    Years Ended December 31,  
    2020     2019  
Telecom   $ 8,640     $ 23,753  
Government/Military     120       589  
Marine     5       83  
Other (backup DC power to various industries)     266       376  
Total net sales   $ 9,031     $ 24,801  
Schedule of Reconciliation of the Product Warranty Liability

The following is a tabular reconciliation of the product warranty liability, excluding the deferred revenue related to the Company’s warranty coverage:

 

    Years End December 31,  
    2020     2019  
Changes in estimates for warranties            
Balance at beginning of the period   $ 375     $ 175  
Payments     (634 )     (530 )
Provision for warranties     859       730  
                 
Balance at end of the period   $ 600     $ 375  
Schedule of Components of Inventories

As of December 31, 2020 and 2019, inventories consisted of the following:

 

    Years Ended December 31,  
    2020     2019  
Raw materials   $ 5,527     $ 8,051  
Finished goods     3,567       5,861  
Inventories   $ 9,094     $ 13,912  
Schedule of Estimated Life

Estimated useful lives of the principal classes of assets are as follows:

 

    Estimated life
Production tooling, jigs, fixtures   3-5 years
Shop equipment and machinery   5 years
Vehicles   3-5 years
Leasehold improvements   Shorter of the lease term or estimated useful life
Office equipment   5 years
Software   5 years
Schedule of Diluted Earnings Per share

The following potentially dilutive shares were excluded from the shares used to calculate diluted earnings per share as their inclusion would be anti-dilutive:

 

    December 31,  
    2020     2019  
Options     140,000       140,000  
Warrants     370,000       120,000  
Total     510,000       260,000