Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION - The 2018 Equity Incentive Plan (Details)

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SHARE-BASED COMPENSATION - The 2018 Equity Incentive Plan (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
RSU grants with performance goals that have not been determined (in shares)   (128,624)      
2018 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized (in shares)         6,685,696
Stock options granted (in shares)   (15,000) 0 (2,044,815)  
Stock options grants forfeited (in shares)       7,558  
RSU grants (in shares)   (1,031,740) (36,657) (202,200)  
Stock option grants forfeited in 2019 (in shares)   220,045 326,173    
RSUs forfeited (in shares)   21,277 60,421    
Common shares available for issuance under the plan at end of period (in shares) 4,796,176 3,862,134 4,796,176 4,446,239  
2018 Equity Incentive Plan | Restricted Stock Units (RSUs) - Performance Based With Market Condition          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
RSU grants (in shares) (95,057) (139,598,000)   (95,057,000)  
RSUs forfeited (in shares)   71,383,000 23,674,000    
Liability-classified award fair value   $ 0.8