Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Amounts recorded as expense in the consolidated statement of operations
Stock-based compensation	$ 1,115	$ 575	$ 1,674	$ 1,199
Cost of revenue [Member]
Amounts recorded as expense in the consolidated statement of operations
Stock-based compensation	104	59	151	123
Technology and development [Member]
Amounts recorded as expense in the consolidated statement of operations
Stock-based compensation	79	67	137	134
Sales and marketing [Member]
Amounts recorded as expense in the consolidated statement of operations
Stock-based compensation	136	104	224	213
General and administration [Member]
Amounts recorded as expense in the consolidated statement of operations
Stock-based compensation	$ 796	$ 345	$ 1,162	$ 729