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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of stock option activity
The following table summarizes stock option activity for the years ended December 31, 2021 and 2020:
Options
Outstanding		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Life (Years)		Aggregated
Intrinsic
Value
Outstanding at December 31, 201914,936,726 $2.13 —$— 
Granted15,854,166 0.60 —— 
Exercised(2,421,657)0.78 —2,421,499 
Expired(1,682,658)2.72 —— 
Forfeited(1,599,161)1.58 —— 
Outstanding at December 31, 202025,087,416 1.29 7.9218,554,241 
Granted9,562,000 2.49 —— 
Exercised(5,589,084)1.50 —7,731,175 
Expired(2,966,509)1.69 —— 
Forfeited(4,250,042)1.10 —— 
Outstanding at December 31, 202121,843,781 1.74 8.064,596,393 
Vested as of December 31, 202114,264,369 1.53 7.713,927,341 
Expected to vest as of December 31, 20217,579,412 2.15 9.37669,052 
Schedule of assumptions used to estimate the fair values of the share options For the options with performance and service conditions, the assumptions used to estimate the fair values of the stock options
granted in the year ended December 31, 2021, 2020 and 2019 are as follows:
Year ended
December 31, 2021December 31, 2020December 31, 2019
Expected term (in years)
4.79-7.17
5.15-5.52
5.52
Expected volatility
112%-130%
101%-122%
98 %
Expected dividend yield— %— %— %
Risk free interest rate
0.51%-1.29%
0.39%-0.44%
2.51 %



For the options with market conditions, the assumptions used to estimate the fair values of the stock options granted in the year ended December 31, 2021 as follows:
Expected term (in years)1.88
Expected volatility106.92 %
Expected dividend yield— %
Risk free interest rate1.31 %
Schedule of warrants outstanding and exercisable
A summary of the warrants is as follows:
20212020
Warrants OutstandingNumber of
Warrants
Outstanding and
Exercisable		Number of
Warrants
Outstanding and
Exercisable		Exercise
Price		Expiration
Date
Service providers200,000 200,000 $5.00 July 1, 2022
Service providers700,000 700,000 2.50 
February 28, 2022-October 1, 2022
Service providers100,000 — 7.50 January 1, 2023
Service providers100,000 — 9.00 January 1, 2023
1,100,000 900,000 
Schedule of unvested restricted shares
A summary of the unvested restricted shares is as follows:
SharesWeighted-average fair value
Non-vested restricted shares outstanding at December 31, 2020— 
Granted5,025,000 2.46 
Forfeited— — 
Vested(5,025,000)2.46 
Non-vested restricted shares outstanding at December 31, 2021— —