Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS - Assets Measured at Fair Value on a Nonrecurring Basis (Details)

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FAIR VALUE MEASUREMENTS - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Nonrecurring Basis - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Reported Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property and equipment, net $ 0 $ 2,000
Goodwill 0  
Estimate of Fair Value Measurement | Quoted prices in active market (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property and equipment, net 0 0
Goodwill 0  
Estimate of Fair Value Measurement | Significant other observable inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property and equipment, net 0 2,000
Goodwill 0  
Estimate of Fair Value Measurement | Significant other unobservable inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Property and equipment, net 0 $ 0
Goodwill $ 0