Accounts Receivable, net (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of allowance for doubtful accounts
Beginning balance	$ 109	$ 655	$ 646
Provision	1,064	48	90
Write-offs	(2)	(598)	(87)
Recoveries	1	4	6
Ending balance	$ 1,172	$ 109	$ 655