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BORROWINGS (Future Principal Payments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term Debt $ 44,179 $ 8,843
Master Lease Agreement | U.S. Bank Equipment Finance    
Debt Instrument [Line Items]    
2017 3,256  
2018 3,356  
2019 3,479  
2020 3,502  
2021 1,494  
Thereafter 0  
Long-term Debt 15,087  
Loan Agreement    
Debt Instrument [Line Items]    
2017 1,031  
2018 1,124  
2019 1,124  
2020 1,124  
2021 1,124  
Thereafter 40,233  
Long-term Debt $ 45,760