Accounts Payable and Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts Payable and Accrued Liabilities, Current [Abstract]
Trade accounts payable	$ 5,607	$ 2,925
Accrued professional fees	295	215
Income taxes payable	6,913	4,389
Sales taxes payable	2,651	3,206
Other accrued liabilities	31	394
Accounts payable and accrued liabilities	$ 15,497	$ 11,129