Consolidated Statements of Operations (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock-based compensation included in costs and expenses:
Stock-based compensation expense	$ 2,973	$ 1,801	$ 1,914
Costs of Services [Member]
Stock-based compensation included in costs and expenses:
Stock-based compensation expense	303	286	131
Costs of Product Sales [Member]
Stock-based compensation included in costs and expenses:
Stock-based compensation expense	114	19	8
Selling, General and Administrative [Member]
Stock-based compensation included in costs and expenses:
Stock-based compensation expense	2,316	1,346	1,742
Product Development [Member]
Stock-based compensation included in costs and expenses:
Stock-based compensation expense	$ 240	$ 150	$ 33