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STOCK-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Stock Awards Granted

The following table summarizes the Company’s stock awards granted for each of the periods indicated:

 

 

 

For the Three Months Ended September 30,

 

 

For the Nine Months Ended September 30,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

 

 

Grants

 

 

Weighted

Average

Grant

Date Fair

Value

 

 

Grants

 

 

Weighted

Average

Grant

Date Fair

Value

 

 

Grants

 

 

Weighted

Average

Grant

Date Fair

Value

 

 

Grants

 

 

Weighted

Average

Grant

Date Fair

Value

 

Stock options

 

 

359,182

 

 

$

68.31

 

 

 

221,398

 

 

$

21.07

 

 

 

2,011,863

 

 

$

43.17

 

 

 

4,678,357

 

 

$

14.49

 

Restricted stock units

 

 

5,990

 

 

$

138.04

 

 

 

—

 

 

$

—

 

 

 

175,410

 

 

$

76.27

 

 

 

181,029

 

 

$

33.03

 

Restricted stock awards

 

 

10,500

 

 

$

142.71

 

 

 

—

 

 

$

—

 

 

 

27,590

 

 

$

98.57

 

 

 

341,500

 

 

$

34.58

 

 
Summary of Stock-Based Compensation Expense by Function Included within Condensed Consolidated Statements of Operations and Comprehensive Loss

The following table summarizes stock-based compensation expense by function included within the unaudited condensed consolidated statements of operations and comprehensive loss:

 

 

 

For the Three Months Ended

September 30,

 

 

For the Nine Months Ended

September 30,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

 

 

(in thousands)

 

Research and development

 

$

3,260

 

 

$

1,812

 

 

$

10,349

 

 

$

5,881

 

Selling, general and administrative

 

 

8,224

 

 

 

5,110

 

 

 

26,940

 

 

 

17,218

 

Total stock-based compensation expense

 

$

11,484

 

 

$

6,922

 

 

$

37,289

 

 

$

23,099

 

 
Summary of Stock-Based Compensation Expense by Grant Type Included within Condensed Consolidated Statements of Operations and Comprehensive Loss

 

The following table summarizes stock-based compensation expense by grant type included within the unaudited condensed consolidated statements of operations and comprehensive loss:

 

 

 

For the Three Months Ended

September 30,

 

 

For the Nine Months Ended

September 30,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

 

 

(in thousands)

 

Stock options

 

$

9,007

 

 

$

5,420

 

 

$

27,362

 

 

$

17,221

 

Restricted stock awards/units

 

 

1,987

 

 

 

954

 

 

 

8,654

 

 

 

4,408

 

Employee stock purchase plan

 

 

490

 

 

 

548

 

 

 

1,273

 

 

 

1,470

 

Total stock-based compensation expense

 

$

11,484

 

 

$

6,922

 

 

$

37,289

 

 

$

23,099