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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Share-Based Payment Arrangement, Option, Activity
A summary of the Company’s stock option activity under the 2021 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, 2023
798 $19,885.20 8.74$5,351 
Expired/forfeited(390)$20,794.36 
Outstanding as of December 31, 2024
408 $21,156.47 7.59$8,317 
Expired/forfeited(24)$19,176.00 
Outstanding as of December 31, 2025
384 $21,280.25 6.60$— 
Exercisable as of December 31, 2025
315 $21,774.93 6.59$— 
Schedule of Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
A summary of the Company’s RSU activity under the 2021 Plan is as follows:
 (dollars in thousands except weighted average fair value)
Shares
Weighted Average Fair Value
Outstanding as of December 31, 2023(1)
2,885$3,784.80 
Granted1,797,111 $3.72 
Released(1,322,382)$1.31 
Forfeited(37,207)$2.32 
Outstanding as of December 31, 2024
440,407$3.61 
Granted
441,177 $1.69 
Released(263,311)$4.35 
Forfeited
(170,909)$2.93 
Outstanding as of December 31, 2025
447,364 $2.05 
Schedule of Nonvested Restricted Stock Units Activity
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, 2023
2,031 $26,408.80 5.92$31,743 
Expired/forfeited(82)$28,973.01 
Outstanding as of December 31, 2024
1,949 $26,237.95 4.84$50,054 
Expired/forfeited(180)$25,209.72 
Outstanding as of December 31, 2025
1,769 $26,342.58 3.58$— 
Exercisable as of December 31, 2025
1,753 $26,277.84 3.56$— 
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, 2023
564 $60,169.20 6.64$16,318 
Expired/forfeited(77)$95,528.84 
Outstanding as of December 31, 2024
487 $52,893.32 5.50$25,481 
Expired/forfeited(56)$101,355.16 
Outstanding as of December 31, 2025
431 $46,596.66 4.87$— 
Exercisable as of December 31, 2025
195 $58,591.00 5.11$— 
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 2021 Plan, EI Plan, and STI Plan and awards outside these plans included in each respective expense category in the Consolidated Statements of Operations and Comprehensive Loss is as follows:
 (in thousands)20252024
Research and development$124 $2,670 
Sales and marketing36 915 
General and administrative2,990 4,797 
$3,150 $8,382