Income Taxes - Schedule 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, beginning balance	$ 523	$ 404
Tax positions taken in the current period, gross increases	795	229
Tax positions taken in a prior period, gross increases	1,082	0
Tax positions taken in a prior period, gross decreases	0	(88)
Settlements with taxing authorities	0	0
Lapse of applicable statute of limitations	(16)	(22)
Unrecognized tax benefits, ending balance	$ 2,384	$ 523