Accounts Payable and Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of accounts payable and accrued expenses
Accounts payable	$ 1,543	$ 910
Payable to benefit providers and transit agencies	17,121	6,491
Accrued payables	5,288	5,843
Accrued compensation and related benefits	7,651	6,926
Other accrued expenses	1,726	792
Deferred revenue	2,042	453
Accounts payable and accrued expenses	$ 35,371	$ 21,415