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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for doubtful accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period $ 25 $ 25 $ 25
Charged to Costs and Expenses 0 0 0
Net (Write-Offs)/ Recoveries 0 0 0
Balance at End of Period 25 25 25
Deferred tax asset valuation allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 4,525 4,694 4,401
Charged to Costs and Expenses 922 0 293
Net (Write-Offs)/ Recoveries 0 (169) 0
Balance at End of Period $ 5,447 $ 4,525 $ 4,694