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Stockholders' Equity (Deficit) - Schedule of Performance Stock Units (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
PSUs Awards Outstanding [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Beginning balance, number of shares 2,404  
Share-based compensation arrangement by share-based payment award, grants in period 7,337  
Forfeited, number of shares (72)  
Ending balance, number of shares [1] 9,669  
Beginning balance, weighted average grant date fair value $ 1.08  
Granted, weighted average grant date fair value 1.05  
Forfeited, weighted average grant date fair value 1.07  
Ending balance, weighted average grant date fair value $ 1.06  
Aggregate intrinsic value $ 7,155 $ 2,909
PSUs Awards Vested and Not Settled [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Ending balance, number of shares 1,680  
Ending balance, weighted average grant date fair value $ 1.16  
Aggregate intrinsic value $ 1,243  
[1] The number of PSUs represents the base number of PSUs that may vest. The actual number of PSUs that will vest will be between zero and 14,901,178 depending on the Company’s achievement of certain revenue milestones over the period from 2021 through 2023 and certain earnings before interest, taxes, depreciation and amortization (EBITDA) milestones between 2021 and 2023.