Income Taxes - Reconcilliation of Unrecognized Tax Benefits (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits	$ 123	$ 57
Additions based on tax positions related to the current year	50	50
Additions for tax positions of prior years	0	16
Reductions for lapse of statute of limitations	0	0
Settlements	0	0
Unrecognized Tax Benefits	$ 173	$ 123