Cash, Cash Equivalents, Restricted Cash, and Short-term Investments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash and Cash Equivalents [Line Items]
Cash	$ 930	$ 729
Money market	9,084	8,167
Total cash and cash equivalents	10,014	8,896	14,004
Corporate bonds	6,191	907
Total short-term investments	6,191	907
Total restricted cash	375	375
Total	$ 16,580	$ 10,178