Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2016

Supplemental Cash Flow Elements [Abstract]

Cash Payments and Non-Cash Activity

Selected cash payments and non-cash activities were as follows:

	Years ended December 31,
	2016		2015		2014
Supplemental cash flow information:
Cash paid for interest	$	28	$	55	$	7
Cash paid for income taxes	$	2,576	$	4,682	$	10,844
Supplemental noncash investing and financing activities:
Transfer of service and sales demonstration inventory to fixed assets	$	511	$	2,979	$	41