Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2016

Supplemental Cash Flow Elements [Abstract]

Summary of Supplemental Cash Flow Information

The following additional information is provided with respect to the condensed consolidated statements of cash flows (in thousands):

	Six Months Ended June 30,
	2016		2015
Noncash Investing and Financing Activities:
Transfers from inventory to field equipment	$	10,267	$	8,772
Transfers from field equipment to deferred cost of revenues	7,136		6,268
Payment of corporate bonus in common stock	—		1,103
Market value of shares received in payment for exercise of stock options	1,470		745
Construction-in-process financed by construction liability	—		669
Property and equipment acquired under capital lease	—		354