Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Shareholders' Equity and Capital Stock - addl information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
shares
Mar. 31, 2018
USD ($)
shares
Mar. 30, 2018
shares
Mar. 31, 2019
$ / shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Sep. 25, 2018
shares
Stockholder's Equity Note [Line Items]              
Vesting period 5 years            
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Intrinsic Value | $         $ 1,470    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0            
Share Price | $ / shares       $ 1.05      
Number of RSUs Vested 9,053            
Percent or RSUs that vest 9,053            
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number         9,631,612 9,731,612  
stock options exercisable         5,913,421    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number         6,113,421    
Stock based compensation | $ $ 188 $ 330          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ $ 100            
Proceeds from Stock Options Exercised | $   $ 42          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares         $ 1.00 $ 1.00  
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         9,431,612    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options | $         $ 1,000    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 2 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 | $         $ 500    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 3 months 18 days            
Granted, Options 0 0          
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%