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Revenue Recognition (Tables)
3 Months Ended
Mar. 31, 2018
Revenue Recognition Tables  
Disaggregation of Revenue
Three months ended March 31, 2018  Services Revenues  Products Revenue  Total Revenue
Timing of revenue recognition:               
Products and services transferred over time  7,026,000   —     7,026,000 
Products and services transferred at a point in time   —      393,000    393,000 
Total  7,026,000   393,000   7,419,000 
Schedule of Changes in Deferred Revenue
Balance at December 31, 2017  $372,000 
Reclassification of beginning deferred revenue to revenue, as a result of performance obligations satisfied.   (122,000)
Cash received in advance and not recognized as revenue.   421,000 
Cumulative catch-up from a change in the timeframe for recognition of revenue arising from deferred revenue.   —   
Balance at March 31, 2018  $671,000