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Equity (Details 2)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Option Indexed to Issuers Equity [Line Items]  
Outstanding options, Number 1,016,867
Exercisable options, Number 722,734
$1.45 [Member]  
Option Indexed to Issuers Equity [Line Items]  
Outstanding options, Average exercise price | $ / shares $ 1.45
Outstanding options, Number 112,000
Outstanding options, Average remaining contractual life (years) 4 years
Exercisable options, Average exercise price | $ / shares $ 1.45
Exercisable options, Number 112,000
Exercisable options, Average remaining contractual life (years) 4 years
$2.30 [Member]  
Option Indexed to Issuers Equity [Line Items]  
Outstanding options, Average exercise price | $ / shares $ 2.30
Outstanding options, Number 94,000
Outstanding options, Average remaining contractual life (years) 5 years 9 months 7 days
Exercisable options, Average exercise price | $ / shares $ 2.30
Exercisable options, Number 75,200
Exercisable options, Average remaining contractual life (years) 5 years 9 months 7 days
$5.31 [Member]  
Option Indexed to Issuers Equity [Line Items]  
Outstanding options, Average exercise price | $ / shares $ 5.31
Outstanding options, Number 131,000
Outstanding options, Average remaining contractual life (years) 6 years 7 months 21 days
Exercisable options, Average exercise price | $ / shares $ 5.31
Exercisable options, Number 78,600
Exercisable options, Average remaining contractual life (years) 6 years 7 months 21 days
$1.64 [Member]  
Option Indexed to Issuers Equity [Line Items]  
Outstanding options, Average exercise price | $ / shares $ 1.64
Outstanding options, Number 234,000
Outstanding options, Average remaining contractual life (years) 7 years 7 months 6 days
Exercisable options, Average exercise price | $ / shares $ 1.64
Exercisable options, Number 234,000
Exercisable options, Average remaining contractual life (years) 7 years 7 months 6 days
$1.88 [Member]  
Option Indexed to Issuers Equity [Line Items]  
Outstanding options, Average exercise price | $ / shares $ 1.88
Outstanding options, Number 445,867
Outstanding options, Average remaining contractual life (years) 8 years 2 months 19 days
Exercisable options, Average exercise price | $ / shares $ 1.88
Exercisable options, Number 222,934
Exercisable options, Average remaining contractual life (years) 8 years 2 months 19 days