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Share incentive plan (Tables)
12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of each Ordinary share option issued was estimated at the date of grant using the following weighted-average assumptions:
 
 
 
Year ended December 31,
 
 
 
2016
 
2015
 
2014
 
Risk-free interest rate
 
 
1.18%-2.06%
 
 
1.30% -1.90%
 
 
1.55%-2.21%
 
Expected option term (years)
 
 
5.00-7.00
 
 
5.12-7.00
 
 
5.12-7.00
 
Expected price volatility
 
 
79.34%-90.65%
 
 
70.40%-83.74%
 
 
69.49%-84.63%
 
Dividend yield
 
 
0%
 
 
0%
 
 
0%
 
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
A summary of option activity as of December 31, 2016, and the year then ended is presented below:
 
 
 
 
 
 
 
 
 
Weighted-
 
 
 
 
 
 
 
 
 
 
 
 
Average
 
 
 
 
 
 
 
 
 
Weighted-
 
 
Remaining
 
 
Aggregate
 
 
 
Number of
 
 
Average
 
 
Contractual
 
 
Intrinsic
 
 
 
Stock Options
 
 
Exercise Price
 
 
Term (Years)
 
 
Value
 
Outstanding, January 1, 2016
 
 
2,103,502
 
 
$
5.81
 
 
 
8.52
 
 
$
1,584,753
 
Exercised
 
 
-
 
 
 
-
 
 
 
 
 
 
 
 
 
Granted
 
 
1,658,416
 
 
$
2.21
 
 
 
 
 
 
 
 
 
Forfeited/Expired
 
 
(1,110,137)
 
 
$
6.16
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding, December 31, 2016
 
 
2,651,781
 
 
$
3.41
 
 
 
7.74
 
 
$
419,840
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exercisable, December 31, 2016
 
 
1,300,224
 
 
$
4.47
 
 
 
6.00
 
 
$
419,696
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Vested and expected to vest, December 31, 2016
 
 
2,651,781
 
 
$
3.41
 
 
 
7.74
 
 
$
419,840
 
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
Share-based compensation expense is classified in the consolidated statements of operations as follows:
 
 
 
December 31,
 
 
 
2016
 
 
2015
 
 
2014
 
 
 
U.S. dollars in thousands
 
 
 
 
 
 
 
 
 
 
 
Research and development expenses
 
$
531
 
 
$
381
 
 
$
83
 
Pre-commercialization expenses
 
 
(147)
 
 
 
159
 
 
 
-
 
General and administrative expenses
 
 
316
 
 
 
2,083
 
 
 
653
 
 
 
$
700
 
 
$
2,623
 
 
$
736