Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Changes in Allowance for Doubtful Accounts

For the years ended December 31, 2017, 2016 and 2015, changes in the allowance for doubtful accounts were as follows (in thousands):

	2017			2016			2015
Balance at beginning of year	$	565		$	500		$	282
Provision charged to selling, general and administrative expenses		283			135			285
Allowance resulting from acquisitions		52			15			5
Write-offs, net of recoveries of amounts previously reserved		(358	)		(82	)		(29	)
Divestiture of JK Lasers		—			—			(30	)
Exchange rate changes		12			(3	)		(13	)
Balance at end of year	$	554		$	565		$	500

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
Revenue	$	23,526	$	25,599
Income from operations	$	5,537	$	7,362
Net income	$	5,389	$	6,925

Summary of Financial Information of Laser Quantum - Balance Sheet

	December 31,
	2016
Total assets (1)	$	25,043
Total liabilities	$	1,556

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