Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Assets Measured on Nonrecurring Basis (Details)

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Fair Value Measurement - Assets Measured on Nonrecurring Basis (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total gains (losses), goodwill $ 0   $ 0  
Nonrecurring Basis        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total gains (losses), property and equipment, net   $ 0   $ (3,405,000)
Total gains (losses), goodwill   0   0
Reported Value Measurement | Nonrecurring Basis        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Property and equipment, net   0   2,000,000
Goodwill   0   0
Estimate of Fair Value Measurement | Nonrecurring Basis | 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   0
Estimate of Fair Value Measurement | Nonrecurring Basis | Significant other observable inputs (Level 2)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Property and equipment, net   0   2,000,000
Goodwill   0   0
Estimate of Fair Value Measurement | Nonrecurring Basis | 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   $ 0