Summary of Financial Information of Laser Quantum - Balance Sheet (Details) (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Financial Statements Information [Line Items]
Cash and cash equivalents	$ 68,108	$ 59,959	$ 51,146	$ 60,980
Laser Quantum
Schedule Of Financial Statements Information [Line Items]
Cash and cash equivalents	$ 15,500	$ 21,000