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131 - Disclosure - Common Stock and Stock Option Plan (Tables)
(http://dicerna.com/taxonomy/role/NotesToFinancialStatementsCommonStockAndStockOptionsDisclosureTextBlockTables)
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Reporting Entity [Axis]0001399529 (http://www.sec.gov/CIK)
Text Block [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
Text Block [Abstract]
 
Assumptions Used in the Black-Scholes Option-Pricing Model for Stock Options Granted

The assumptions used in the Black-Scholes option-pricing model for stock options granted, including Inducement Grants (where applicable), during the years ended December 31, 2016, 2015 and 2014 are as follows:

 

     YEARS ENDED DECEMBER 31,  
     2016     2015     2014  

Expected option term (in years)

      5.5 – 6.3       5.5 – 6.3       5.5 – 6.3  

Expected volatility

      71% – 79 %      67% – 71 %      64% – 65 % 

Risk-free interest rate

      1.2% – 2.0 %      1.5% – 1.9 %      1.7% – 2.0 % 

Expected dividend yield

      0.0 %      0.0 %      0.0 % 
  
Stock Option Activity for Employee and Nonemployee

A summary of stock option activity for employee and non-employee awards under the 2014 Plan, as amended, as well as activity related to the Inducement Grants, is presented below:

 

     NUMBER
OF
OPTIONS		      WEIGHTED-
AVERAGE
PRICE
PER SHARE		      WEIGHTED-
AVERAGE
REMAINING
CONTRACTUAL
TERM (YEARS)		  

OUTSTANDING—January 1, 2016

      4,399,425      $ 12.24        8.1  

Granted

      1,538,775        7.08     

Exercised

      (115,699 )       3.42     

Forfeited/Canceled

      (723,052 )       12.80     
  

 

 

        

OUTSTANDING—December 31, 2016

      5,099,449        10.80        7.9  
  

 

 

        

EXERCISABLE—December 31, 2016

      2,811,975        11.57        7.4  

Vested and expected to vest as of December 31, 2016

      5,001,694      $ 10.85        7.9  

  
Summary of Company's Restricted Common Stock

A summary of the Company’s restricted common stock is presented below:

 

     SHARES      WEIGHTED-
AVERAGE
GRANT DATE
FAIR VALUE
PER SHARE		  

Nonvested—December 31, 2015

      30,000      $ 16.30  

Vested

      (10,000 )       16.30  
  

 

 

     

 

 

  

Nonvested—December 31, 2016

      20,000      $ 16.30  
  

 

 

     

 

 

  

 

 

  
Stock-Based Compensation Expense

Stock-based compensation expense is classified in the Company’s consolidated statements of operations as follows:

 

     YEARS ENDED DECEMBER 31,  
        2016            2015            2014     

Research and development expenses

    $ 4,467      $ 4,202      $ 4,183  

General and administrative expenses

      4,698        5,530        4,054  
  

 

 

     

 

 

     

 

 

  

Total

    $ 9,165      $ 9,732      $ 8,237  
  

 

 

     

 

 

     

 

 

  

 

  
Summary of Common Stock Warrants Outstanding

The following table summarizes information about common stock warrants outstanding at December 31, 2016:

 

EXERCISE

PRICE

    NUMBER
OF
WARRANTS		      REMAINING
LIFE
(YEARS)		  

$250.00

      2,198        3.46  

$7.00

      85,703        1.48  
  

 

 

     
     87,901