XML 45 R35.htm IDEA: XBRL DOCUMENT v3.20.2
Summary of Significant Accounting Policies - Stock-Based Compensation (Details)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
installment
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
shares
Mar. 31, 2019
USD ($)
Jun. 30, 2020
$ / shares
shares
Jun. 30, 2019
$ / shares
shares
Sep. 30, 2020
USD ($)
plan
installment
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
Dec. 31, 2019
item
$ / shares
shares
Dec. 31, 2017
item
shares
Dec. 31, 2016
item
shares
Jun. 30, 2018
shares
Stock-Based Compensation                              
Number of employee share-based compensation plans | plan                   3          
Number of Stock Options                              
Exercised (in shares)                   (175,000)          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]                              
Proceeds from Stock Options Exercised | $                   $ 793,000 $ 811,000        
Directors' deferred share unit compensation | $   $ 149,000 $ 45,000 $ 91,000 $ 46,000 $ 100,000 $ 100,000                
ESPP                              
Weighted-average assumptions used to estimate the fair value of each stock option                              
Dividend (as a percent)     0.00%     0.00%                  
Volatility (as a percent)     85.70%     67.30%                  
Risk-free interest rate (as a percent)     1.57%     2.51%                  
Expected life     6 months     6 months                  
Weighted-Average Grant Date Fair Value                              
Awarded (in dollars per share) | $ / shares               $ 1.86 $ 1.63            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]                              
Aggregate number of common shares reserved for future issuance                             1,000,000
Allocated Share-based Compensation Expense | $                   $ 188,000 345,000        
Shares, Issued     78,000     323,000   78,000 323,000            
Stock options and restricted stock awards                              
Stock-Based Compensation                              
Vesting period                   3 years          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]                              
Allocated Share-based Compensation Expense | $   3,700,000     $ 3,600,000         $ 10,300,000 $ 10,700,000        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $   $ 20,700,000               $ 20,700,000          
Stock options                              
Weighted-average assumptions used to estimate the fair value of each stock option                              
Dividend (as a percent)   0.00%     0.00%         0.00% 0.00%        
Volatility (as a percent)   88.30%     81.60%         85.00% 76.30%        
Risk-free interest rate (as a percent)   0.36%     1.78%         1.23% 2.24%        
Expected life   6 years     6 years         6 years 6 years        
Weighted-average grant date fair value (in dollars per share) | $ / shares   $ 4.56     $ 1.68         $ 4.57 $ 2.85        
Number of Stock Options                              
Outstanding at the beginning of the period (in shares)               13,518,000   13,518,000          
Granted (in shares)                   7,256,000          
Exercised (in shares)                   (175,000)          
Forfeited/Canceled (in shares)                   (1,715,000)          
Outstanding at the end of the period (in shares)   18,884,000   13,518,000           18,884,000   13,518,000      
Weighted-Average Exercise Price                              
Outstanding at the beginning of the period (in dollars per share) | $ / shares               $ 7.53   $ 7.53          
Granted (in dollars per share) | $ / shares                   4.57          
Exercised (in dollars per share) | $ / shares                   2.81          
Forfeited/Canceled (in dollars per share) | $ / shares                   9.52          
Outstanding at the end of the period (in dollars per share) | $ / shares   $ 6.26   $ 7.53           $ 6.26   $ 7.53      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]                              
Proceeds from Stock Options Exercised | $                   $ 500,000          
Stock options | Minimum                              
Weighted-Average Exercise Price                              
Exercised (in dollars per share) | $ / shares                   $ 2.31          
Stock options | Maximum                              
Weighted-Average Exercise Price                              
Exercised (in dollars per share) | $ / shares                   $ 3.05          
Performance shares                              
Stock-Based Compensation                              
Number of equal installments | installment 2                 4          
Number of Stock Options                              
Granted (in shares)                   2,600,000          
Outstanding at the end of the period (in shares)   128,700               128,700          
Number of Restricted Stock Shares                              
Awarded (in shares) 295,200                     57,400 57,400 57,400  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]                              
Allocated Share-based Compensation Expense | $                   $ 0          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $   $ 9,400,000               $ 9,400,000          
Restricted stock                              
Stock-Based Compensation                              
Number of equal installments | item                       3 3 3  
Number of Restricted Stock Shares                              
Unvested at the beginning of the period (in shares)               1,297,000   1,297,000          
Vested (in shares)                   (513,000)          
Forfeited (in shares)                   (487,000)          
Unvested at the end of the period (in shares)   297,000   1,297,000           297,000   1,297,000      
Weighted-Average Grant Date Fair Value                              
Unvested at the beginning of the period (in dollars per share) | $ / shares               $ 2.97   $ 2.97          
Vested (in dollars per share) | $ / shares                   2.62          
Forfeited (in dollars per share) | $ / shares                   3.62          
Unvested at the end of the period (in dollars per share) | $ / shares   $ 2.55   $ 2.97           $ 2.55   $ 2.97      
Restricted stock | Officers                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]                              
Allocated Share-based Compensation Expense | $                   $ 0          
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $   $ 142,000               $ 142,000          
Previous 2016 and 2006 stock option plans                              
Stock-Based Compensation                              
Common stock authorized for issuance (in shares)   19,500,000               19,500,000          
2018 Plan                              
Stock-Based Compensation                              
Common stock authorized for issuance (in shares)   7,500,000               7,500,000          
Inducement Plan                              
Stock-Based Compensation                              
Number of employee share-based compensation plans | plan                   2          
Common stock authorized for issuance (in shares)       1,500,000               1,500,000      
Vesting period                   4 years          
Exercise period                   10 years