Selected Balance Sheet Accounts (Details 4) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Selected Balance Sheet Accounts [Abstract]
Accrued employee-related benefits	$ 4,530	$ 3,945
Other accrued expenses and other current liabilities:
Other accrued expenses	7,278	5,751
Amounts due to customers	466	486
Other current liabilities	571	562
Total other accrued expenses and other current liabilities	8,315	6,799
Total accrued expenses and other current liabilities	$ 12,845	$ 10,744