Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

SHARE-BASED COMPENSATION - Options activities (Details)

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SHARE-BASED COMPENSATION - Options activities (Details) - Options - $ / shares
 1 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2018
Dec. 31, 2017
Dec. 31, 2018
Mar. 31, 2017
Number of shares        
Outstanding at the beginning of the period (in shares)   2,451,067 2,377,067 1,904,067
Granted (in shares)   50,000 1,053,150 900,000
Exercised (in shares)     (119,792)  
Forfeited (in shares)   (50,000) (123,438) (100,000)
Cancelled (in shares) (1,772,584)   (1,901,752)  
Expired (in shares)   (74,000) (143,023) (253,000)
Outstanding at the end of the period (in shares)   2,377,067 1,142,212 2,451,067
Vested and expected to vest at the end of the period (in shares)     1,142,212  
Exercisable at the end of the period (in shares)     36,978  
Weighted average exercise        
Outstanding at the beginning of the period (in dollars per share)   $ 2.21 $ 2.18 $ 2.61
Granted (in dollars per share)   2.35 0.58 1.71
Exercised (in dollars per share)     1.77  
Forfeited (in dollars per share)   1.71 1.71 1.71
Cancelled (in dollars per share)     2.13  
Expired (in dollars per share)   3.60 3.89 3.60
Outstanding at the end of the period (in dollars per share)   $ 2.18 0.67 $ 2.21
Vested and expected to vest at the end of the period (in dollars per share)     0.67  
Exercisable at the end of the period (in dollars per share)     $ 1.71  
Weighted remaining contractual Years        
Vested and expected to vest at the end of the period     9 years 8 months 16 days  
Exercisable at the end of the period     8 years 18 days