Annual report pursuant to Section 13 and 15(d)

Long-Term Debt (Aggregate maturities of long-term debt and revolving lines of credit) (Details)

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Long-Term Debt (Aggregate maturities of long-term debt and revolving lines of credit) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Long-Term Debt [Abstract]    
2019 $ 41  
2020 43  
2022 22,062  
Total future long-term debt payments 22,146  
Unamortized discount   $ (814)
Total carrying amount of long-term debt 22,146 20,842
Less current portion (41)  
Long-term debt obligations $ 22,105 $ 20,842