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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of the company’s stock option activity
A summary of the Company’s stock option activity under the SI Plan is as follows (dollars in thousands except weighted average exercise price):
Number of
Options		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual Life (Years)		Aggregate
Intrinsic
Value
Outstanding as of December 31, 2021
— $— 
Granted8,633,607 $3.04 
Exercised— 
Cancelled/forfeited(1,987,155)3.96 
Outstanding as of December 31, 2022
6,646,452 $2.76 8.97$— 
Exercisable as of December 31, 2022
2,675,027 1.85 8.38— 
A summary of the Company’s stock option activity under the EI Plan is as follows (dollars in thousands except weighted average exercise price):
Number of
Options		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Life (Years)		Aggregate
Intrinsic
Value
Outstanding as of December 31, 2020
30,402,801 $2.45 8.75$885 
Granted5,287,031 4.74 
Exercised(2,757,671)2.30 7,740 
Expired/forfeited(969,240)3.65 
Outstanding as of December 31, 2021
31,962,921 $2.81 7.77$86,075 
Granted— — 
Exercised(1,606,795)2.52 3,658 
Expired/forfeited(6,933,850)2.58 8,784 
Outstanding as of December 31, 2022
23,422,276 $2.83 6.92$22 
Exercisable as of December 31, 2022
16,013,998 $2.63 6.62$21 
A summary of the Company’s stock option activity under the STI Plan is as follows (dollars in thousands except weighted average exercise price):
Number of
Options		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Life (Years)		Aggregate
Intrinsic
Value
Outstanding as of December 31, 2020
6,490,208 $2.49 9.26$1,174 
Granted5,516,399 7.82 
Exercised(1,630,925)2.54 8,807 
Expired/forfeited(848,955)2.68 
Outstanding as of December 31, 2021
9,526,727 $5.55 8.01$13,905 
Granted— $— 
Exercised(2,181,335)2.50 1,468 
Expired/forfeited(1,726,880)7.78 
Outstanding as of December 31, 2022
5,618,512 $6.34 6.94$— 
Exercisable as of December 31, 2022
1,181,230 $3.96 6.20$— 
Schedule of weighted-average assumptions used in the black-scholes option pricing model
The weighted-average assumptions used in the Black-Scholes option pricing model for awards granted during the year ended December 31, 2022 are as follows:
2022
Risk-free interest rate:2.73 %
Expected term (in years):6.99
Expected volatility:67.00 %
Dividend yield:0 %
Grant date fair value per share$3.19 
The weighted-average assumptions used in the Black-Scholes option pricing model for awards granted during the year ended December 31, 2021 are as follows:
2021
Risk-free interest rate:0.79 %
Expected term (in years):6.05
Expected volatility:42.10 %
Dividend yield:0.00 %
The weighted-average assumptions used in the Black-Scholes option pricing model for awards granted during the year ended December 31, 2021 are as follows:
2021
Risk-free interest rate:1.39 %
Expected term (in years):9.06
Expected volatility:35.86 %
Dividend yield:0.00 %
Schedule of stock-based compensation expense included in each respective expense category
The following table presents stock-based compensation expense for all of the Company’s SI Plan, EI Plan, STI Plan and Common Units of FF Global Partners LLC included in each respective expense category in the Consolidated Statements of Operations and Other Comprehensive Loss for the years ended December 31 (dollars in thousands):
20222021
Research and development$13,118 $4,001 
Sales and marketing1,744 1,185 
General and administrative2,791 6,159 
$17,653 $11,345 
The following table presents stock-based compensation expense related to RSAs included in each respective expense category in the Consolidated Statements of Operations and Other Comprehensive Loss for the year ended December 31, 2021 (dollars in thousands):
Restricted stock awards for employee bonus, net2021
Research and development$7,613 
Sales and marketing2,310 
General and administrative8,694 
$18,617 
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
A summary of the Company’s RSU activity under the SI Plan is as follows:

Shares
Weighted Average Fair Value
Outstanding as of December 31, 2021
—$— 
Granted
29,247,487 $0.87 
Released(10,015,141)$0.40 
Forfeited
(1,362,683)$1.30 
Outstanding as of December 31, 2022
(1)17,869,663 $1.09 

(1)     The Company’s subsidiaries in China have employees who are citizens of People’s Republic of China (PRC). Pursuant to the regulation Circular 78 and Circular 7 issued by the Central State Administration of Foreign Exchange of PRC (“SAFE”), we cannot release vested RSUs to it’s PRC citizen employees before they have completed the required SAFE registration with a dedicated account set up for each of them to repatriate proceeds back to China under the SAFE. As a result, 1,448,697 RSUs of the Company’s PRC citizens employees vested in 2022 were included in the outstanding RSUs at December 31, 2022 as unreleased RSUs because those employees did not complete the SAFE registration process.