Summary of Changes in Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Goodwill [Line Items]
Balance at beginning of the period	$ 103,456
Balance at end of the period	108,337
Lincoln Laser Company
Goodwill [Line Items]
Net working capital adjustment of Lincoln Laser acquisition	(43)
Reach Technology Inc.
Goodwill [Line Items]
Goodwill acquired from Reach acquisition	$ 4,924