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Stock Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Stock Incentive Plans  
Summary of stock option activity

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Weighted

 

 

 

 

 

 

 

 

 

 

Average

 

 

 

 

 

 

 

Weighted-

 

Remaining

 

Aggregate

 

 

 

 

Average Exercise

 

Contractual

 

 

Instrinsic Value

 

    

Shares

    

Price

    

Term (years)

    

(in thousands)

Outstanding at December 31, 2017

 

283,277

 

$

45.42

 

7.75

 

$

216

Granted

 

213,384

 

$

9.84

 

 

 

 

 

Exercised

 

(291)

 

$

12.40

 

 

 

 

 

Cancelled or forfeited

 

(62,981)

 

$

37.64

 

 

 

 

 

Outstanding at December 31, 2018

 

433,389

 

$

29.05

 

7.97

 

$

 —

Vested and Exercisable at December 31, 2018

 

168,566

 

$

50.91

 

6.31

 

$

 —

 

Schedule of assumptions made based on the Black-Scholes option pricing model

 

 

 

 

 

 

 

 

 

 

 

 

 

Year Ended December 31, 

 

    

2018

    

2017

    

Weighted-average expected volatility

 

73.7

-

 76.9

%  

76.1

-

 81.9

%  

Expected term (in years)

 

5.75

-

 6.25

 

6.25

-

 9.77

 

Risk-free interest rate

 

2.67

-

 2.84

%  

2.00

-

 2.38

%  

Expected dividend yield

 

 

 

 0

%  

 

 

 0

%