Selected Balance Sheet Accounts (Details 4) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accrued expenses and other current liabilities
Compensation and related costs	$ 3,247	$ 5,149
Professional fees and other accrued expenses	5,836	3,383
Amounts due to customers	404	267
Other current liabilities	447	696
Total accrued expenses and other current liabilities	$ 9,934	$ 9,495