Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Details 3)

v3.3.1.900
STOCK-BASED COMPENSATION (Details 3)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
item
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
$ / shares
shares
Dec. 31, 2012
shares
Stock Based Compensation                
Number of homogenous groups for purposes of determining fair values of options | item   3            
Share-based compensation | $ $ 1,500,000 $ 7,403,000 $ 9,787,000 $ 7,166,000        
Employee Stock Purchase Plan                
Weighted-average assumptions relating to options granted                
Risk-free interest rate (as a percent)   0.60% 0.30% 0.20%        
Expected term (in years)   1 year 6 months 1 year 8 months 12 days 1 year 4 months 24 days        
Dividend yield (as a percent)   0.00% 0.00% 0.00%        
Expected volatility (as a percent)   61.20% 66.00% 64.40%        
Employee Stock Option                
Stock Based Compensation                
Contractual term of the option   10 years            
Weighted-average assumptions relating to options granted                
Risk-free interest rate (as a percent)   1.80% 2.20% 1.10%        
Expected term (in years)   6 years 6 months 6 years 6 months 5 years 4 months 24 days        
Dividend yield (as a percent)   0.00% 0.00% 0.00%        
Expected volatility (as a percent)   65.00% 74.40% 72.20%        
Shares Available For Grant                
Authorized for grant (in shares)       7,775,000        
Cancelled (in shares)   1,525,076 2,017,430 1,213,131        
Number of Shares Underlying Options                
Outstanding at the beginning of the period (in shares)   16,970,673 15,532,202 13,604,377        
Granted (in shares)   3,875,170 3,467,120 3,140,956        
Exercised (in shares)   (214,295) (11,219)          
Cancelled (in shares)   (1,525,076) (2,017,430) (1,213,131)        
Outstanding at the end of the period (in shares) 16,970,673 19,106,472 16,970,673 15,532,202        
Vested and expected to vest (in shares)         18,958,691      
Exercisable (in shares)         15,089,131 14,243,893 13,246,612  
Weighted Average Exercise Price                
Outstanding at the beginning of the period (in dollars per share) | $ / shares   $ 9.07 $ 10.55 $ 11.52        
Granted (in dollars per share) | $ / shares   2.28 3.39 5.46        
Exercised (in dollars per share) | $ / shares   2.75 3.44          
Cancelled (in dollars per share) | $ / shares   17.56 10.75 8.26        
Outstanding at the end of the period (in dollars per share) | $ / shares $ 9.07 $ 7.08 $ 9.07 $ 10.55        
Vested and expected to vest (in dollars per share) | $ / shares         $ 7.12      
Exercisable (in dollars per share) | $ / shares         $ 8.24 $ 10.09 $ 11.44  
Weighted Average Remaining Contractual Term (in years)                
Outstanding at the end of the period   5 years 10 months 6 days            
Exercisable   5 years 29 days            
Aggregate Intrinsic Value                
Outstanding at the end of the period (in dollars) | $         $ 3,053,499      
Exercisable | $         $ 865,450      
Number of nonvested stock options (in shares)         4,017,340 2,726,779    
Intrinsic value of nonvested stock options | $         $ 2,200,000 $ 24,000    
Aggregate intrinsic value of options exercised | $   $ 252,000 $ 10,000          
Unrecognized compensation cost related to purchase plan | $         $ 276,000      
Weighted-average recognition period of unamortized compensation cost   10 months 24 days 4 months 24 days          
Number of shares vested   2,326,021 2,456,622          
Weighted-average exercise price for shares vested during the period (in dollars per share) | $ / shares   $ 3.13 $ 4.74          
Additional disclosures                
Options granted (in shares)   (3,875,170) (3,467,120) (3,140,956)        
Options cancelled (in shares)   1,525,076 2,017,430 1,213,131        
Options outstanding at the end of the period (in shares) 16,970,673 16,970,673 15,532,202 13,604,377 19,106,472 16,970,673 15,532,202 13,604,377
Grant-date weighted-average fair value (in dollars per share) | $ / shares   $ 1.40 $ 2.32 $ 3.34        
Total unrecognized compensation cost, net of estimated forfeitures | $         $ 4,300,000      
Shares of common stock available for future grant         5,245,977 7,596,071 9,045,761 3,198,586
Options exercised during the period (in shares)   214,295 11,219          
Employee Stock Option | Consultant                
Stock Based Compensation                
Contractual term of the option   10 years            
Performance Shares                
Shares Available For Grant                
Cancelled (in shares) 250,000              
Number of Shares Underlying Options                
Outstanding at the beginning of the period (in shares)   700,000            
Granted (in shares)   1,175,000 950,000          
Cancelled (in shares) (250,000)              
Outstanding at the end of the period (in shares) 700,000   700,000          
Additional disclosures                
Options granted (in shares)   (1,175,000) (950,000)          
Options cancelled (in shares) 250,000              
Options outstanding at the end of the period (in shares) 700,000 700,000 700,000     700,000