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Stockholders' Deficit - Schedule of Outstanding Awards Issued to Share-based Payment Award Plan and Inducement Grants (Parenthetical) (Details)
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Share-based Payment Award, Award Vesting Rights   (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 11,687,530 depending on the Company’s achievement of certain performance goals.   (2) The number of remaining shares of common stock available for future issuance is based on an assumption that the maximum performance goals for PSUs were achieved, where applicable.   (3) As of December 31, 2021, outstanding options have exercise prices ranging from $1.07 to $2.73 and will expire between January 2022 and June 2030. Unvested RSUs will vest between January 2022 and December 2024. If and when certain performance goals are achieved, then unvested PSUs will vest between June 2022 and March 2024.   (4) As of December 31, 2021, outstanding options have exercise prices ranging from $2.55 to $8.92 and will expire between March 2022 and February 2029.   (5) As of December 31, 2021, outstanding options have exercise prices ranging from $1.80 to $8.92 and will expire between January 2022 and February 2029.   (6) As of December 31, 2021, unvested RSUs will vest between August 2022 and October 2024 and unvested PSUs upon achievement of certain performance goals will vest between October 15, 2022 and August 2024.
Performance Shares Unit [Member] | Minimum [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of shares expected to vest | shares 0
Performance Shares Unit [Member] | Maximum [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of shares expected to vest | shares 11,687,530
Options [Member] | 2019 Plan [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Exercise price range, lower limit $ 1.07
Exercise price range, upper limit 2.73
Options [Member] | 2012 Plan [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Exercise price range, lower limit 2.55
Exercise price range, upper limit 8.92
Options [Member] | 2009 Plan [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Exercise price range, lower limit 1.80
Exercise price range, upper limit $ 8.92