Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Feb. 28, 2013 Subsequent Event
Operating Leased Assets [Line Items]
2013	$ 126		$ 228
2014	32		304
2015	7		76
Total minimum lease payments	165
Operating lease expense	$ 318	$ 347
Extension of lease term			24 months
Cost per square foot			18.50