Summary of Financial Information of Laser Quantum - Balance Sheet (Details) (Laser Quantum, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Laser Quantum
Schedule Of Financial Statements Information [Line Items]
Total assets	$ 25,423	[1]	$ 20,990	[1]
Total liabilities	$ 2,482		$ 4,240

[1] Total assets at December 31, 2014 and 2013 include cash and cash equivalent of $17.1 million and $13.6 million, respectively.