Quarterly report pursuant to Section 13 or 15(d)

Equity - Summary of Option Activities (Details)

v3.19.2
Equity - Summary of Option Activities (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Number of Shares    
Number of shares outstanding, beginning of period (in shares) 2,794,000  
Granted (in shares) 45,000  
Options exercised (in shares) (25,000)  
Number of shares outstanding, end of period (in shares) 2,814,000 2,794,000
Number of shares exercisable, end of period (in shares) 839,333  
Weighted Average Grant Date Fair Value    
Weighted average grant date fair value, outstanding, beginning of period (in dollars per share) $ 1.78  
Weighted average grant date fair value, granted (in dollars per share) 0.80  
Weighted average grant date fair value, exercised (in dollars per share) 0.13  
Weighted average grant date fair value, outstanding, end of period (in dollars per share) 1.80 $ 1.78
Weighted average grant date fair value, exercisable (in dollars per share) 2.11  
Weighted Average Exercise Price    
Weighted average exercise price, outstanding balance (in dollars per share) 2.61  
Weighted average exercise price, granted (in dollars per share) 1.15  
Weighted average exercise price, granted (in dollars per share) 0.20  
Weighted average exercise price, outstanding balance (in dollars per share) 2.63 $ 2.61
Weighted average exercise price, exercisable (in dollars per share) $ 3.15  
Weighted average remaining contractual term (in years), outstanding 8 years 5 months 1 day 9 years 5 months 4 days
Weighted average remaining contractual term (in years), exercisable 8 years 1 month 24 days  
Aggregate intrinsic value, outstanding balance $ 6,800 $ 21,200
Aggregate intrinsic value, exercisable $ 6,800