Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION - Narrative (Details)

v3.20.4
STOCK-BASED COMPENSATION - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2021
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
company
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Jun. 11, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost | $       $ 2.7    
Unrecognized weighted average period       1 year 3 months 18 days    
Aggregate intrinsic value, exercised in period | $       $ 0.1 $ 4.3  
Number of peers included in calculation of expected volatility | company     5      
Equity Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option, maximum term       10 years    
Granted (USD per share) | $ / shares       $ 0.41    
Unvested options granted (shares)       6,210,000    
Options outstanding (shares)       25,225,000 28,105,000  
Stock Option Modification            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock based compensation expense | $   $ 0.1        
Granted (USD per share) | $ / shares   $ 0.66        
Unvested options granted (shares)   2,130,000        
Unrecognized compensation cost | $   $ 0.2        
Options Outside the Amended 2013 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options outstanding (shares)       5,000,000    
Unvested stock options (shares)       8,000,000    
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (USD per share) | $ / shares         $ 2.14  
Options outstanding (shares)       0    
Options vested (shares)         2,950,000,000  
Fair value of RSU's vested | $         $ 6.3  
Operating Income (Loss)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock based compensation expense | $       $ 3.9 15.1  
Former Founders            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock based compensation expense | $         $ 9.5  
Minimum | Equity Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period       2 years    
Maximum | Equity Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period       4 years    
Amended 2013 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares authorized under plan (shares)       34,976,000    
Shares unissued and reserved for issuance (shares)       6,165,000    
Annual increase in shares available for issuance as percent of total shares outstanding (percent)           4.00%
Annual increase to shares authorized for issuance under the Plan (shares)           4,000,000
Amended 2013 Plan | Equity Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock option, maximum term       10 years    
Amended 2013 Plan | Minimum | Equity Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period       2 years    
Amended 2013 Plan | Maximum | Equity Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period       4 years    
Amended 2013 Plan | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for issuance under the Plan (shares) 4,000,000