Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2019

Supplemental Cash Flow Elements [Abstract]

Schedule of cash Payments and Non-Cash Activity

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

	Years ended December 31,
	2019		2018		2017
Supplemental cash flow information:
Cash paid for interest	$	6	$	4	$	9
Cash paid for income taxes	$	5,498	$	5,813	$	2,488
Supplemental noncash investing and financing activities:
Transfer of service and sales demonstration inventory to fixed assets	$	3,044	$	964	$	2,844