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Share-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity under 2014 Plan and 2021 Plan

 

 

Three Months Ended March 31, 2022

 

 

 

Number of
options

 

 

Weighted
average
exercise
price

 

 

Weighted
average
remaining
contractual
term (in years)

 

 

Aggregate
intrinsic value
(1) (in thousands)

 

Outstanding at the beginning of the period

 

 

19,494,202

 

 

$

1.95

 

 

 

6.88

 

 

$

19,214

 

Granted

 

 

1,552,395

 

 

$

1.61

 

 

 

 

 

 

 

Exercised

 

 

(2,164,870

)

 

$

0.95

 

 

 

 

 

 

 

Forfeited

 

 

(426,122

)

 

$

5.06

 

 

 

 

 

 

 

Outstanding at the end of the period

 

 

18,455,605

 

 

$

1.97

 

 

 

7.15

 

 

$

14,220

 

Exercisable at the end of the period

 

 

13,432,414

 

 

$

0.86

 

 

 

5.92

 

 

$

13,623

 

 

Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]

The following table summarizes the activity for RSUs for the three months ended March 31, 2022:

 

 

 

Three months ended March 31, 2022

 

 

 

Number of
restricted stock units

 

 

Weighted
average grant-date
fair value

 

Nonvested at beginning of the period

 

 

2,330,094

 

 

$

3.58

 

Granted

 

 

3,452,961

 

 

$

1.61

 

Vested

 

 

(116,613

)

 

$

3.58

 

Forfeited

 

 

(215,518

)

 

$

3.33

 

Nonvested at end of the period

 

 

5,450,924

 

 

$

2.35

 

Summary of Stock-Based Compensation Expense

The following table sets forth the total stock-based compensation expense related to stock options and restricted stock units included in the respective components of operating expenses in the condensed consolidated statements of operations:

 

 

 

Three Months Ended March 31,

 

(in thousands)

 

2022

 

 

2021

 

Research and development, net

 

$

546

 

 

$

172

 

Clinical Operations

 

 

122

 

 

 

71

 

Sales and Marketing

 

 

777

 

 

 

877

 

General and administrative

 

 

923

 

 

 

393

 

Total stock-based compensation expense

 

$

2,368

 

 

$

1,513