Annual report pursuant to Section 13 and 15(d)

BORROWINGS BORROWINGS - Short-term Borrowings (Details)

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BORROWINGS BORROWINGS - Short-term Borrowings (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
May 23, 2019
Short-term Debt [Line Items]        
Paid-in-kind interest $ 1,773,000 $ 0 $ 0  
Fair value of warrant       $ 3,300,000
2019 Term Loan        
Short-term Debt [Line Items]        
Principal amount       60,000,000.0
Deferred financing costs       2,200,000
Right to additional borrowing       $ 15,000,000.0
Debt interest rate (as a percentage) 12.00%     12.00%
Paid-in-kind interest each quarter (as a percentage) (up to) 4.00%     4.00%
Paid-in-kind interest $ 1,800,000      
Debt required collateral balance 30,000,000.0      
Final fee (as a percentage)       20.00%
Final payment fee $ 12,600,000      
Fair value of warrant       $ 3,300,000