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Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Stock Option Activity

The activity for the Company’s 2014 Plan and 2015 Plan, for the three months ended March 31, 2024, is summarized as follows:

 

 

 

Number of
Shares

 

 

Weighted-
Average
Exercise
Price

 

 

Weighted-
Average
Remaining
Contractual
Life (in years)

 

 

Aggregate
Intrinsic
Value ($000)

 

Outstanding — December 31, 2023

 

 

1,867,795

 

 

$

10.72

 

 

 

6.10

 

 

$

184

 

Granted

 

 

862,060

 

 

$

1.86

 

 

 

 

 

 

 

Forfeited/Cancelled

 

 

(13,253

)

 

$

7.84

 

 

 

 

 

 

 

Outstanding — March 31, 2024

 

 

2,716,602

 

 

$

7.92

 

 

 

7.11

 

 

$

 

Exercisable — March 31, 2024

 

 

1,389,304

 

 

$

13.35

 

 

 

4.99

 

 

$

 

Vested or expected to vest — March 31, 2024

 

 

2,716,602

 

 

$

7.92

 

 

 

7.11

 

 

$

 

Schedule of Restricted Stock Units ("RSU") Activity

Restricted stock unit (“RSU”) activity under the 2014 Plan and 2015 Plan for the three months ended March 31, 2024, is summarized as follows:

 

 

Number of
Shares

 

 

Weighted
Average
Grant Date
Fair Value
Per Share

 

Non-vested at December 31, 2023

 

 

1,886,374

 

 

$

2.28

 

Granted

 

 

1,877,940

 

 

$

1.88

 

Vested

 

 

(553,182

)

 

$

3.03

 

Forfeited

 

 

(9,120

)

 

$

2.15

 

Non-vested at March 31, 2024

 

 

3,202,012

 

 

$

1.91

 

Stock-Based Compensation Expense Related to Stock Options

Stock-based compensation expense related to stock options is included in the following line items in the accompanying unaudited condensed consolidated statements of operations (in thousands):

 

 

 

Three Months Ended March 31,

 

 

 

2024

 

 

2023

 

Research and development

 

$

195

 

 

$

374

 

Selling, general and administrative

 

 

510

 

 

 

333

 

Total

 

$

705

 

 

$

707