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Stock Award Plan and Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Schedule of Stock Option Activity for Employees and Non-Employees Stock option activity for employees and non-employees for the three months ended March 31, 2019 is as follows:

 

 

Shares

Issuable

Pursuant to

Stock

Options

 

 

Weighted-

Average

Exercise Price

 

 

Weighted-

Average

Remaining

Contractual

Term

(Years)

 

 

Total

Intrinsic

Value (in

thousands)

 

Outstanding January 1, 2019

 

 

8,498,047

 

 

$

6.99

 

 

 

8.1

 

 

$

5,214

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Granted

 

 

 

 

$

 

 

 

 

 

 

 

 

 

Exercised

 

 

(87,500

)

 

$

6.00

 

 

 

 

 

 

 

 

 

Forfeited

 

 

(31,875

)

 

$

6.51

 

 

 

 

 

 

 

 

 

Outstanding March 31, 2019

 

 

8,378,672

 

 

$

7.00

 

 

 

7.8

 

 

$

11,212

 

Exercisable March 31, 2019

 

 

4,078,271

 

 

$

6.46

 

 

 

6.8

 

 

$

7,635

 

Available for future grant

 

 

801,654

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Schedule of RSU Activity

RSU activity under the Plan for the three months ended March 31, 2019 is as follows:

 

 

 

 

 

 

 

Weighted-

Average

 

 

 

 

 

 

 

Grant Date

 

 

 

RSUs

 

 

Fair Value

 

Unvested January 1, 2019

 

 

127,300

 

 

$

11.71

 

Granted

 

 

 

 

$

 

Vested

 

 

 

 

$

 

Forfeited

 

 

 

 

$

 

Unvested March 31, 2019

 

 

127,300

 

 

$

11.71

 

Schedule of Stock-Based Compensation Expense Included in the Company's Consolidated Statements of Operations The following table presents stock-based compensation expense included in the Company’s consolidated statements of operations:

 

 

 

Three Months Ended

 

 

 

March 31,

 

 

 

2019

 

 

2018

 

Research and development

 

$

700,263

 

 

$

524,146

 

General and administrative

 

 

1,761,436

 

 

 

1,589,790

 

Total

 

$

2,461,699

 

 

$

2,113,936

 

 

Employee Stock Option  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Summary of Assumptions Used in Black Scholes Model to Estimate Fair Value of Stock Options

The Company uses the Black-Scholes model to estimate the fair value of stock options granted. For stock options granted to employees during the three months ended March 31, 2019 and 2018, the Company utilized the following assumptions:

 

 

 

March 31,

 

 

 

2019(1)

 

 

2018

 

Expected term (years)

 

 

 

 

 

6.25

 

Risk free interest rate

 

 

 

 

 

2.33

%

Volatility

 

 

 

 

 

83

%

Dividend yield

 

 

 

 

 

0

%

Weighted average grant date fair value per share of

   common stock

 

 

 

 

$

4.47

 

 

(1)

There were no stock options granted to employees during the three months ended March 31, 2019.

Non-Employees Stock Options  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Summary of Assumptions Used in Black Scholes Model to Estimate Fair Value of Stock Options

For stock options granted to non-employees, the Company utilized the following assumptions:

 

 

 

March 31,

 

 

 

2019(1)

 

 

2018

 

Expected term (years)

 

 

 

 

8.4-9.8

 

Risk free interest rate

 

 

 

 

2.71-2.74%

 

Volatility

 

 

 

 

85-113%

 

Dividend yield

 

 

 

 

 

0

%

Weighted average reporting date fair value per share of common stock

 

 

 

 

$

5.56

 

 

(1)

There were no stock options granted to non-employees during the three months ended March 31, 2019.