Selected Balance Sheet Accounts (Details 4) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Accrued expenses and other current liabilities
Compensation and related costs	$ 2,245	$ 5,149
Professional fees and other accrued expenses	5,375	3,383
Amounts due to customers	341	267
Other current liabilities	973	696
Total accrued expenses and other current liabilities	$ 8,934	$ 9,495