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Stockholders' Equity And Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2023
Summary of Stock Option Activity

Stock option activity for the six months ended June 30, 2023 is as follows (in thousands, except per share amounts):

 

 

 

Options Outstanding

 

 

 

Number of
Shares
Subject
to Options

 

 

Weighted
Average
Exercise
Price Per
Share

 

Balance at December 31, 2022

 

 

146

 

 

$

25.48

 

Options exercised

 

 

 

 

$

 

Options canceled / forfeited / expired

 

 

(26

)

 

$

21.43

 

Balance at June 30, 2023

 

 

120

 

 

$

26.35

 

Summary of Restricted Stock Awards and Units

Information with respect to outstanding restricted stock awards and units (including both time-based vesting and performance-based vesting) as of June 30, 2023 is as follows (in thousands, except per share amounts):

 

 

 

Restricted Stock and Restricted Stock Units

 

 

 

Number of
Shares
Subject to
Time-
based Vesting

 

 

Number of
Shares
Subject to
Performance-
based Vesting

 

 

Total
Number of
Shares

 

 

Weighted
Average
Grant Date
Fair Value
Per Share

 

Balance at December 31, 2022

 

 

3,713

 

 

 

891

 

 

 

4,604

 

 

$

20.35

 

Awards and units granted

 

 

2,960

 

 

 

718

 

 

 

3,678

 

 

$

11.47

 

Awards and units vested / earned

 

 

(790

)

 

 

 

 

 

(790

)

 

$

20.33

 

Awards and units canceled / forfeited

 

 

(147

)

 

 

 

 

 

(147

)

 

$

16.59

 

Balance at June 30, 2023

 

 

5,736

 

 

 

1,609

 

 

 

7,345

 

 

$

15.98

 

Summary of Stock-Based Compensation Expense

The effect of recording stock-based compensation expense for the three and six months ended June 30, 2023 and 2022 is as follows (in thousands):

 

 

 

Three Months Ended June 30,

 

 

Six Months Ended June 30,

 

 

 

2023

 

 

2022

 

 

2023

 

 

2022

 

Cost of revenue, excluding depreciation and amortization of intangible assets

 

$

927

 

 

$

773

 

 

$

1,719

 

 

$

1,398

 

Research and development

 

 

6,405

 

 

 

5,681

 

 

 

11,956

 

 

 

10,780

 

Selling, general and administrative

 

 

10,759

 

 

 

4,085

 

 

 

20,384

 

 

 

6,998

 

Total stock-based compensation expense

 

$

18,091

 

 

$

10,539

 

 

$

34,059

 

 

$

19,176

 

 

Stock-Based Compensation Expense Categorized by Award Type

Stock-based compensation expense categorized by award type for the three and six months ended June 30, 2023 and 2022 is summarized in the table below (in thousands):

 

 

 

Three Months Ended June 30,

 

 

Six Months Ended June 30,

 

 

 

2023

 

 

2022

 

 

2023

 

 

2022

 

Restricted stock awards and units

 

$

16,706

 

 

$

9,548

 

 

$

31,686

 

 

$

17,371

 

Employee stock purchase plan

 

 

1,385

 

 

 

991

 

 

 

2,373

 

 

 

1,805

 

Total stock-based compensation expense

 

$

18,091

 

 

$

10,539

 

 

$

34,059

 

 

$

19,176

 

Employee Stock Purchase Plan  
Schedule of Valuation Assumptions Used in Estimating Fair Value and Awards Granted

The following table summarizes the valuation assumptions used in estimating the fair value of the 2022 ESPP for the offering period in effect using Black-Scholes option pricing model:

 

 

Six Months Ended June 30,

 

 

2023

Expected life (years)

 

0.5 — 2.0

Risk-free interest rate

 

4.33% — 5.44%

Dividend yield

 

—%

Expected volatility

 

44.11% — 51.19%

Market-Based Performance Stock Units  
Schedule of Valuation Assumptions Used in Estimating Fair Value and Awards Granted

The following assumptions were used to value the market-based PSUs granted during the period:

 

 

Six Months Ended June 30,

 

 

 

2023

 

Expected life (years)

 

 

2.8

 

Risk-free interest rate

 

 

4.54

%

Dividend yield

 

 

%

Expected volatility

 

 

49.02

%