Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation

v3.19.3
Stock-based Compensation
9 Months Ended
Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock-based Compensation

12. Stock-based Compensation

The Company grants qualified and non-qualified stock options, RSUs, common stock and other stock-based awards under various plans to directors, officers, employees and other individuals. Stock options are granted at exercise prices of not less than the fair market value of the Company’s common stock on the date of grant. Additionally, the Company has an Employee Stock Purchase Plan (“ESPP”) that allows employees to purchase Company shares at a purchase price equal to 85% of the lower of the fair market value of the Company’s common stock on the first trading day of the offering period or on the last day of the offering period.

Stock Options

Stock options generally vest monthly over three to four years for employees and one year for directors. Stock options held by employees who qualify for retirement age (defined as employees that are a minimum of 55 years of age and the sum of their age plus years of full-time employment with the Company exceeds 70 years) vest on the earlier of scheduled vest date or the date of retirement.

The fair value of the stock options granted during the three and nine months ended September 30, 2019 and 2018, was estimated based on the following weighted average assumptions:

 

Three Months Ended September 30,

 

 

Nine Months Ended September 30,

 

 

2019

 

 

2018

 

 

2019

 

 

2018

 

Dividend yield

 

0

%

 

 

0

%

 

 

0

%

 

 

0

%

Expected volatility

 

101

%

 

 

101

%

 

 

103

%

 

 

101

%

Risk-free interest rate

 

1.71

%

 

 

2.76

%

 

 

2.49

%

 

 

2.72

%

Expected term

5.47 years

 

 

5.60 years

 

 

5.60 years

 

 

5.60 years

 

Stock option activity for the nine months ended September 30, 2019, was as follows:

 

Number of

shares

 

 

Weighted

Average

Exercise

Price

Per Share

 

 

Weighted

Average Remaining

Contractual Term

(in years)

 

 

Aggregate

Intrinsic

Value

(in

thousands)

 

Outstanding at beginning of year

 

1,624,746

 

 

$

23.09

 

 

 

 

 

 

 

 

 

Granted

 

400,814

 

 

 

14.49

 

 

 

 

 

 

 

 

 

Exercised

 

(50,513

)

 

 

4.86

 

 

 

 

 

 

 

 

 

Forfeited, expired or cancelled

 

(165,432

)

 

 

33.83

 

 

 

 

 

 

 

 

 

Outstanding at end of period

 

1,809,615

 

 

$

20.71

 

 

 

7.05

 

 

$

16,127

 

Exercisable at end of period

 

1,347,408

 

 

$

23.16

 

 

 

6.47

 

 

$

12,921

 

The aggregate intrinsic value of stock options exercised during the nine months ended September 30, 2019 and 2018 was $0.6 million and $1.0 million, respectively.

The weighted-average grant-date fair value per share of the options granted during the nine months ended September 30, 2019 and 2018 was $11.45 and $18.74, respectively.

As of September 30, 2019, $3.7 million of total unrecognized compensation expense related to stock options is expected to be recognized over a weighted average period of 1.69 years.

Performance-Based Stock Options

Stock-based compensation expense associated with the corporate performance-based stock options is recognized if the performance condition is considered probable of achievement using management’s best estimates. As of September 30, 2019, the Company had 41,250 shares remaining related to outstanding performance-based stock options with a grant date fair value of $0.2 million that will vest based solely on the achievement of fiscal year 2019 corporate goals as set by the Compensation Committee of the Company’s Board of Directors. For the nine months ended September 30, 2019, the Company determined that all remaining options were probable of achievement in fiscal year 2019 and therefore the related expense of $0.1 million and $0.2 million was recognized during the three and nine months ended September 30, 2019, respectively. As of September 30, 2019, there was $0.1 million unrecognized compensation costs related to these outstanding performance-based stock options.  

In December 2017, the Company granted 130,000 stock options to executives with corporate performance-based vesting conditions. During the three months ended March 31, 2018, the Board of Directors approved a modification of 80,000 of these options from performance-based vesting to service-based vesting. The remaining 50,000 stock options were cancelled in conjunction with an executive’s resignation.

Modification of Stock Options

In September 2019, the Company entered into a separation agreement with its former Chief Business Officer which resulted in the extension of the exercise period for all of her vested options. As a result of the modification, the Company recorded stock-based compensation expense of $0.5 million during the three months ended September 30, 2019 to reflect the revised expected term based on the modified exercise period for these stock options.

Restricted Stock Units

RSUs generally vest annually over three years for employees and one year for directors. RSUs held by employees who qualify for retirement age (defined as employees that are a minimum of 55 years of age and the sum of their age plus years of full-time employment with the Company exceeds 70 years) vest on the earlier of scheduled vest date or the date of retirement. The valuation of RSUs is determined at the date of grant using the closing stock price.

For the nine months ended September 30, 2019, all remaining RSUs were forfeited and there was no unvested balance as of September 30, 2019.

Stock-based Compensation Expense

The following table shows total stock-based compensation expense for stock options, RSUs and ESPP in the condensed consolidated statements of operations and comprehensive income (loss) (in thousands):

 

Three Months Ended September 30,

 

 

Nine Months Ended September 30,

 

 

2019

 

 

2018

 

 

2019

 

 

2018

 

Research and development

$

66

 

 

$

97

 

 

$

174

 

 

$

296

 

General and administrative

 

1,428

 

 

 

750

 

 

 

4,059

 

 

 

2,737

 

Total stock-based compensation expense

$

1,494

 

 

$

847

 

 

$

4,233

 

 

$

3,033