Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue Recognition [Abstract]

Schedule of Disaggregation of Revenue

The following table presents the Company’s revenue disaggregated by revenue source (in thousands, unaudited):

	Three Months Ended
	March 31,
	2018		2017
Systems	$	56,102	$	43,893
Software licensing, support and maintenance		7,455		7,498
Parts		6,985		6,330
Services		2,554		2,958
Total revenue	$	73,096	$	60,679

The following table represents a disaggregation of revenue by timing of revenue:

	Three Months Ended
	March 31,
	2018
Point in time	$	69,396
Over time		3,700
Total revenue	$	73,096

Schedule of Changes in Deferred Revenue

Changes in deferred revenue were as follows:

	Three Months Ended
	March 31,
	2018
Beginning Balance, December 31, 2017	$	7,206
Deferral of revenue		4,553
Recognition of deferred revenue		(2,986	)
Ending Balance, March 31, 2018	$	8,773