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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Stock Options Activity

The following is a summary of stock options activity during the three months ended March 31, 2020:

 

 

 

Options Outstanding

 

 

 

Number of

Options

 

 

Weighted-

Average

Exercise

Price

 

 

Weighted-

Average

Remaining

Contractual

Life (years)

 

 

Aggregate

Intrinsic

Value

 

Balance—January 1, 2020

 

 

1,862,569

 

 

$

9.09

 

 

 

8.64

 

 

$

99,289

 

Options granted

 

 

 

 

$

 

 

 

 

 

 

 

 

 

Options exercised

 

 

 

 

$

 

 

 

 

 

 

$

 

Options cancelled

 

 

(28,430

)

 

$

8.00

 

 

 

 

 

 

 

 

Balance—March 31, 2020

 

 

1,834,139

 

 

$

9.11

 

 

 

8.51

 

 

$

 

Exercisable as of  March 31, 2020

 

 

911,251

 

 

$

8.85

 

 

 

8.32

 

 

$

 

Vested and expected to vest as of March 31, 2020

 

 

1,834,139

 

 

$

9.11

 

 

 

8.51

 

 

$

 

Summary of Restricted Stock Award Activity

A summary of restricted stock award activity within the Company’s equity plans and changes for the three months ended March 31, 2020, is as follows:

 

Restricted Stock Awards

 

Shares

 

 

Weighted

Average Grant-

Date Fair Value

 

Nonvested at January 1, 2020

 

 

2,601,972

 

 

$

18.21

 

Granted

 

 

439,145

 

 

$

3.05

 

Vested

 

 

(328,000

)

 

$

14.58

 

Forfeited

 

 

(371,320

)

 

$

19.23

 

Nonvested at March 31, 2020

 

 

2,341,797

 

 

$

16.23

 

Summary of Total Stock-based Compensation Expense by Function The following table summarizes the total stock-based compensation expense by function for the three months ended March 31, 2020 and 2019:

 

 

 

Three Months Ended March 31,

 

 

 

2019

 

 

2020

 

 

 

(in thousands)

 

Sales and distribution expenses

 

$

388

 

 

$

1,592

 

Research and development expenses

 

 

161

 

 

 

1,273

 

General and administrative expenses

 

 

951

 

 

 

4,574

 

Total stock-based compensation expense

 

$

1,500

 

 

$

7,439