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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Fair Value Measurements, Recurring and Nonrecurring (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Assets:    
Cash and cash equivalents $ 41,335,000 $ 58,263,000
Restricted cash 4,259,000 3,833,000
Long-term receivable 0 2,531,000
Level 1 | Fair Value, Measurements, Recurring    
Assets:    
Cash and cash equivalents 41,335,000 58,263,000
Restricted cash 4,259,000 3,833,000
Long-term receivable 0 0
Level 2 | Fair Value, Measurements, Recurring    
Assets:    
Cash and cash equivalents 0 0
Restricted cash 0 0
Long-term receivable 0 0
Level 3 | Fair Value, Measurements, Recurring    
Assets:    
Cash and cash equivalents 0 0
Restricted cash 0 0
Long-term receivable 0 2,531,000
Senior secured term loan    
Liabilities:    
Senior secured term loan 247,204,000 247,204,000
Senior secured term loan | Level 1 | Fair Value, Measurements, Recurring    
Liabilities:    
Senior secured term loan 0 0
Senior secured term loan | Level 2 | Fair Value, Measurements, Recurring    
Liabilities:    
Senior secured term loan 210,124,000 201,472,000
Senior secured term loan | Level 3 | Fair Value, Measurements, Recurring    
Liabilities:    
Senior secured term loan $ 0 $ 0