Quarterly report pursuant to Section 13 or 15(d)

Deferred Revenues and Customer Advances (Details)

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Deferred Revenues and Customer Advances (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Deferred Revenues and Customer Advances [Abstract]    
Customer advances on equipment sales $ 2,877,000 $ 2,776,000
Prepaid license fees 2,300,000 1,100,000
Total deferred revenues and customer advances $ 5,177,000 $ 3,876,000