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Net Loss per Share (Tables)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Antidilutive Shares Excluded From Calculation of Diluted Net Loss Per Share
The following table presents the number of anti-dilutive shares excluded from the calculation of diluted net loss per share as of the following dates:
September 30, 2021September 30, 2020
Stock-based compensation awards – EI Plan32,137,760 26,624,013 
Stock-based compensation awards – STI Plan9,529,482 6,180,497 
Restricted stock awards1,364,018 — 
Public Warrants22,977,568 — 
Private Warrants674,551 — 
Other warrants4,544,258 272,729 
Convertible notes payable9,009,210 — 
Total80,236,847 33,077,239