Summary of Financial Information of Laser Quantum - Balance Sheet (Details) - Laser Quantum - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Schedule Of Financial Statements Information [Line Items]
Total assets	[1]	$ 25,043	$ 30,159
Total liabilities		$ 1,556	$ 2,552

[1] Total assets at December 31, 2016 and 2015 included cash and cash equivalents of $15.5 million and $21.0 million, respectively.