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COMMON STOCK, PREFERRED STOCK AND WARRANTS WITH-DOWN ROUND PROTECTION (Schedule of Status of Grants to Employees) (Details) - Options Issued to Employees [Member] - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number      
Balance outstanding at beginning of period 562,803 413,473 450,847
Granted 4,740,318 149,330  
Exercised     (19,769)
Forfeited (66,154)   (17,605)
Balance outstanding at end of the period 5,236,967 562,803 413,473
Balance exercisable at the end of the period 2,428,716 334,735 293,736
Weighted average exercise price (US$)      
Balance outstanding at beginning of period $ 5.64 $ 6.04 $ 5.85
Granted 5.22 4.53  
Exercised     1.82
Forfeited 3.93   6.01
Balance outstanding at end of the period 5.28 5.64 6.04
Balance exercisable at the end of the period $ 5.28 $ 5.81 $ 5.95