Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2018

Revenue Recognition Tables

Disaggregation of Revenue

	Three months ended June 30, 2018						Six months ended June 30, 2018
	Services		Products		Total		Services		Products		Total
	Revenues		Revenue		Revenue		Revenues		Revenue		Revenue
Timing of revenue recognition:
Products and servcies transferred over time	$	7,868,000		—	$	7,868,000	$	14,894,000		—	$	14,894,000
Products and services transferred at a point in time		—	$	377,000	$	377,000		—	$	770,000	$	770,000
Total	$	7,868,000	$	377,000	$	8,245,000	$	14,894,000	$	770,000	$	15,664,000

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		781,000
Cumulative catch-up from a change in the timeframe for recognition of revenue arising from deferred revenue		—
Balance at June 30, 2018	$	1,031,000