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Accounts Receivable (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts Receivable [Line Items]      
Balance at beginning of period $ 376 $ 1,179 $ 1,132
Less: Reduction in (provision for) allowances (146) 528 (96)
Less: Write offs, net of recoveries 90 275 49
Balance at end of period $ 432 $ 376 $ 1,179