Summary of Financial Information of Laser Quantum - Balance Sheet (Details) (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Financial Statements Information [Line Items]
Cash and cash equivalents	$ 59,959	$ 51,146	$ 60,980	$ 65,788
Laser Quantum
Schedule Of Financial Statements Information [Line Items]
Cash and cash equivalents	$ 21,000	$ 17,100