Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Changes in Allowance for Doubtful Accounts

For the years ended December 31, 2016, 2015 and 2014, changes in the allowance for doubtful accounts were as follows (in thousands):

	2016			2015			2014
Balance at beginning of year	$	500		$	282		$	575
Provision charged to selling, general and administrative expenses		135			285			30
Allowance resulting from acquisitions		15			5			52
Write-offs, net of recoveries of amounts previously reserved		(82	)		(29	)		(352	)
Divestiture of JK Lasers		—			(30	)		—
Exchange rate changes		(3	)		(13	)		(23	)
Balance at end of year	$	565		$	500		$	282

Laser Quantum

Summary of Financial Information of Laser Quantum - Income Statement

The summarized financial information for Laser Quantum is as follows (in thousands):

	Year Ended December 31,
	2016		2015		2014
Revenue	$	23,526	$	25,599	$	23,013
Income from operations	$	5,537	$	7,362	$	7,434
Net income	$	5,389	$	6,925	$	6,627

Summary of Financial Information of Laser Quantum - Balance Sheet

	December 31,
	2016		2015
Total assets (1)	$	25,043	$	30,159
Total liabilities	$	1,556	$	2,552

(1) Total assets at December 31, 2016 and 2015 included cash and cash equivalents of $15.5 million and $21.0 million, respectively.