Summary of Financial Information of Laser Quantum - Income Statement (Details) - Laser Quantum - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Financial Statements Information [Line Items]
Revenue	$ 25,599	$ 23,013	$ 16,269
Income from operations	7,362	7,434	4,720
Net income	$ 6,925	$ 6,627	$ 3,745