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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]  
Schedule Of Inventories
   March 31,  December 31,
   2018  2017
Raw materials  $146,000   $68,000 
Work-in-process   14,000    10,000 
Finished goods   325,000    223,000 
   $485,000   $301,000 
Schedule of Property and Equipment
   March 31,  December 31,
   2018  2017
Property and Equipment:          
Production tooling, machinery and equipment  $4,003,000   $4,003,000 
Office furniture and fixtures   325,000    325,000 
Computer equipment and software   2,687,000    2,680,000 
Leasehold improvements   577,000    577,000 
Construction in-progress   448,000    206,000 
    8,040,000    7,791,000 
Accumulated depreciation and amortization   (5,307,000)   (5,121,000)
Net Property and Equipment  $2,733,000   $2,670,000 
Schedule Of Weighted Average Common Shares Outstanding
Three months ended March 31  2018  2017
Denominator for basic net income (loss) per share - weighted average shares   11,819,000    11,661,000 
Effect of dilutive securities:          
Stock options, restricted stock and restricted stock units   163,000    —   
Denominator for diluted net income (loss) per share - weighted average shares   11,982,000    11,661,000