Accrued expenses and other liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrued expenses and other liabilities
Salaries and wages	$ 3,312	$ 3,934
Revenue share	3,676	3,915
Accrued partner network	1,134	1,274
Accrued for construction in progress	1,003	688
Deferred service usage credits		634
Deferred rent	791	223
Accrued taxes		683
Other	1,061	1,408
Total accrued expenses and other liabilities	$ 10,977	$ 12,759