Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Accumulated Other Comprehensive Income

	Foreign Currency		Unrealized			Accumulated Other
	Translation		Gain (Loss) on			Comprehensive
	Adjustments		Investments			Income
Balance as of December 31, 2012	$	1,055	$	12,231		$	13,286
Current period other comprehensive income (loss)		160		(4,626	)		(4,466	)
Balance as of December 31, 2013	$	1,215	$	7,605		$	8,820

Estimated Future Annual Patent Amortization

Year		Amount
	2014	$	205
	2015		191
	2016		183
	2017		170
	2018		75
	Thereafter		843
	Total	$	1,667