Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' DEFICIT - Business Combination and Recapitalization (Details)

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STOCKHOLDERS' DEFICIT - Business Combination and Recapitalization (Details)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Jul. 25, 2018
USD ($)
businessCombination
acquisition
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2020
businessCombination
vote
shares
Dec. 31, 2019
shares
Dec. 31, 2018
shares
Class of Stock [Line Items]          
Common units (in shares) 4,600,000        
Number of business combinations | businessCombination 2   2    
Business acquisition, number of warrants per unit (in shares) 1        
Common stock, shares outstanding (in shares)     67,390,980 67,060,943 67,038,304
Number of votes per share | vote     1    
Stock repurchased during period (in shares)   451,224      
Treasury stock acquired (in dollars per share) | $ / shares   $ 5.29      
Stock repurchased during period | $   $ 2.4      
Preferred stock authorized (in shares)     100,000,000 100,000,000  
MI Acquisitions          
Class of Stock [Line Items]          
Business acquisition, shares issued (in shares) 60,100,000     60,071,200  
Total consideration transferred | $ $ 49.4        
Two Business Acquisition          
Class of Stock [Line Items]          
Business acquisition, shares issued (in shares) 500,000     475,195  
Number of business combinations | acquisition 2        
2018 Equity Incentive Plan          
Class of Stock [Line Items]          
Issued during period (in shares) 3,000,000.0        
Common Stockholders of MI Acquisitions | MI Acquisitions          
Class of Stock [Line Items]          
Business acquisition, shares issued (in shares)       4,918,138  
Number of shares converted (in shares) 4,900,000        
MI Acquisitions Founders | MI Acquisitions          
Class of Stock [Line Items]          
Business acquisition, shares issued (in shares) 453,210     699,454  
Payments to acquire business | $ $ 2.1        
Business acquisition, units issued (in shares) 421,107        
Business acquisition, number of shares per unit (in shares) 1        
Business acquisition, number of shares forfeited (in shares) 174,863        
Sellers Of Priority | MI Acquisitions          
Class of Stock [Line Items]          
Business acquisition, shares issued (in shares)       874,317