Accounts Receivable, net (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Summary of accounts receivable, net
Accounts receivable, gross	$ 30,422	$ 34,790
Less allowance for doubtful accounts	(1,404)	(1,172)
Total accounts receivable, net	$ 29,018	$ 33,618