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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for doubtful accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 167  
Charged to Costs and Expenses $ 167  
Deductions  
Balance at End of Year $ 167 $ 167
Deferred tax asset valuation allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ (16,946) $ (12,335) $ (8,302)
Charged to Costs and Expenses
Deductions $ (2,712) $ (4,611) $ (4,033)
Balance at End of Year $ (19,658) $ (16,946) $ (12,335)