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Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Stock Option Activity

The activity for the Company’s 2009 Stock Option Plan, 2014 Plan, and 2015 Plan, for the three months ended March 31, 2023, 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, 2022

 

 

1,740,308

 

 

$

12.21

 

 

 

6.16

 

 

$

 

Granted

 

 

225,000

 

 

$

1.54

 

 

 

 

 

 

 

Forfeited/Cancelled

 

 

(33,919

)

 

$

7.35

 

 

 

 

 

 

 

Outstanding — March 31, 2023

 

 

1,931,389

 

 

$

11.05

 

 

 

6.45

 

 

$

544

 

Exercisable — March 31, 2023

 

 

1,202,326

 

 

$

15.70

 

 

 

4.82

 

 

$

10

 

Vested or expected to vest — March 31, 2023

 

 

1,931,389

 

 

$

11.05

 

 

 

6.45

 

 

$

544

 

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, 2023, is summarized as follows:

 

 

Number of
Shares

 

 

Weighted
Average
Grant Date
Fair Value
Per Share

 

Non-vested at December 31, 2022

 

 

633,270

 

 

$

5.29

 

Granted

 

 

1,819,575

 

 

$

1.73

 

Vested

 

 

(236,023

)

 

$

5.87

 

Forfeited

 

 

(2,332

)

 

$

5.13

 

Non-vested at March 31, 2023

 

 

2,214,490

 

 

$

2.30

 

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,

 

 

 

2023

 

 

2022

 

Research and development

 

$

374

 

 

$

285

 

Selling, general and administrative

 

 

333

 

 

 

637

 

Total

 

$

707

 

 

$

922