Selected Balance Sheet Accounts (Details 3) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accrued expenses and other current liabilities
Compensation and related costs and professional fees	$ 2,215	$ 4,530
Other accrued expenses	7,087	7,849
Amounts due to customers	431	466
Total other accrued expenses and other current liabilities	7,518	8,315
Total accrued expenses and other current liabilities	$ 9,733	$ 12,845