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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2023
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, 2022
27,694 $662.40 8.97$— 
Granted12,500 259.20 
Exercised(207)213.60 
Expired/forfeited
(8,090)700.50 
Outstanding as of December 31, 2023
31,897 $497.13 8.74$5,351 
Exercisable as of December 31, 2023
10,119 535.83 8.63$2,352 
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, 2022
97,592 $679.20 6.92$22 
Granted— — 
Exercised— — — 
Expired/forfeited(16,389)772.77 
Outstanding as of December 31, 2023
81,203 $660.21 5.92$31,743 
Exercisable as of December 31, 2023
67,592 $632.67 5.75$26,679 
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, 2022
23,410 $1,521.60 6.94$— 
Granted— — 
Exercised— — — 
Expired/forfeited(859)1,968.06 
Outstanding as of December 31, 2023
22,551 $1,504.23 6.64$16,318 
Exercisable as of December 31, 2023
12,106 $901.53 5.99$4,613 
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, 2023 are as follows:
2023
Risk-free interest rate:3.53 %
Expected term (in years):8.71
Expected volatility:89.62 %
Dividend yield:0 %
Grant date fair value per share$259.20 
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 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):
20232022
Research and development$6,812 $13,118 
Sales and marketing807 1,744 
General and administrative1,548 2,802 
$9,167 $17,664 
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, 2022 (1)
74,457$261.60 
Granted
102,012 67.56 
Released(25,970)258.24 
Forfeited
(35,138)245.43 
Outstanding as of December 31, 2023
115,361 $94.62 

(1)     The Company’s subsidiaries in China have employees who are citizens of the 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, 6,037 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.