Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity and Capital Stock - addl information (Details)

v3.19.3
Shareholders' Equity and Capital Stock - addl information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
shares
Jun. 30, 2018
USD ($)
shares
Mar. 31, 2018
USD ($)
shares
Mar. 30, 2018
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2019
$ / shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
shares
Dec. 31, 2018
$ / shares
shares
Dec. 17, 2018
shares
Sep. 25, 2018
shares
Dec. 31, 2017
shares
Stockholder's Equity Note [Line Items]                              
Vesting period             5 years                
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Intrinsic Value | $                   $ 182,000          
Common Stock Shares Issued                   159,947,625   159,729,403 32,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period             218,222                
Share Price | $ / shares                 $ 0.81            
Payments Of Stock Issuance Costs | $               $ 731,000              
Exercise of stock options | $ $ 9,000 $ 134,000 $ 135,000 $ 71,000 $ 42,000                    
Number of RSUs Vested             110,305                
Stock Issued During Period, Value, New Issues | $     7,447,000 $ (4,000)                      
Percent or RSUs that vest             110,305                
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number                   9,101,408   9,731,612      
stock options exercisable                   3,538,338          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number                   6,297,252          
Stock based compensation | $ 200,000   100,000       $ 554,000 727,000              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $             100,000                
Proceeds from Stock Options Exercised | $ $ 100,000   $ 100,000       $ 143,000 $ 247,000              
Granted, Options             0                
RSUs vested but not redeemed (in shares)                   54,431          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                   $ 1.00   $ 1.00      
Capital Stock                              
Stockholder's Equity Note [Line Items]                              
Common Stock Shares Issued   159,935,563 159,147,399 146,715,824 146,599,652     159,147,399   159,947,625 159,729,403 159,729,403     146,531,933
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 12,062 206,160 236,453 116,172 67,719                    
Stock Issued During Period, Shares, New Issues     12,195,122                        
Exercise of stock options | $ $ 13,000 $ 190,000 $ 191,000 $ 103,000 $ 59,000                    
Stock Issued During Period, Value, New Issues | $     $ 7,447,000 $ (4,000)                      
Warrants                              
Stockholder's Equity Note [Line Items]                              
Number of securities called by each warrant                           13,062,878  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares                   $ 0.01          
In Money Stock Option [Member]                              
Stockholder's Equity Note [Line Items]                              
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number                   3,740,338          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options | $                   $ 700,000          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition             1 year 8 months 12 days                
Restricted Stock Units (RSUs) [Member]                              
Stockholder's Equity Note [Line Items]                              
Number of RSUs Vested           62,000                  
Percent or RSUs that vest           62,000                  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options | $                   $ 200,000          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition             10 months 24 days                
Restricted Stock Units (RSUs) [Member] | Capital Stock                              
Stockholder's Equity Note [Line Items]                              
Number of securities called by each warrant                   1          
First Anniversary [Member]                              
Stockholder's Equity Note [Line Items]                              
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Percentage             33.30%                
First Anniversary [Member] | Employee Stock Option [Member]                              
Stockholder's Equity Note [Line Items]                              
Stock Option Vesting Period             3 years                
Second Anniversary [Member]                              
Stockholder's Equity Note [Line Items]                              
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Percentage             33.30%                
Third Anniversary (Member)                              
Stockholder's Equity Note [Line Items]                              
Share-Based Compensation Arrangement By Share-Based Payment Award, Award Vesting Percentage             33.40%