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SHARE-BASED COMPENSATION - 2016 Equity Incentive Plan (Details) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 23, 2018 $ / shares | Jul. 22, 2018 $ / shares | Mar. 31, 2018 USD ($) $ / shares shares | Apr. 01, 2016 $ / shares shares | Mar. 31, 2022 USD ($) installment $ / shares shares | Mar. 31, 2021 USD ($) $ / shares shares | Mar. 31, 2020 USD ($) $ / shares shares
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Option granted (in dollars per shares) | $ 0.88 | $ 1.28 |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |
Option granted (in dollars per shares) | 0.88 | $ 1.28 |  |  |  |  |
2016 Equity Incentive Plan |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Option granted (in shares) | shares |  |  |  | (6,312,000) |  |  |
Option granted (in dollars per shares) |  |  |  | $ 1.28 |  |  | $ 1.03
Common stock, dividends declared (in dollars per share) | 0.40 |  |  |  |  |  |
Number of installments for vested and become exercisable | installment |  |  |  |  | 3 |  |
Percentage of remaining options to be vested |  |  |  |  | 66.67% |  |
Options vested remaining installments | installment |  |  |  |  | 2 |  |
Maximum contractual term (in years) |  |  |  |  | 4 years |  |
Threshold for the unvested options to expire (in years) |  |  |  |  | 2 years |  |
Stock options, vesting period (in years) |  |  |  |  | 3 years |  |
Fair value of options granted to employees |  |  |  |  |  |  |
Fair market value per share |  |  |  |  | $ 1.41 |  |
Exercise price per share |  |  |  |  | $ 1.28 |  |
Risk-free interest rate |  |  |  |  | 1.81% |  |
Dividend yield |  |  |  |  | 0.00% |  |
Life of option |  |  |  |  | 4 years |  |
Volatility |  |  |  |  | 47.40% |  |
Number of options |  |  |  |  |  |  |
Outstanding at beginning of year (in shares) | shares |  |  |  |  | 833,890 | 4,320,954 |
Option granted (in shares) | shares |  |  |  | 6,312,000 |  |  |
Number of Exercise (in shares) | shares |  |  |  |  |  |  | (320,020)
Number of Expired, forfeited or cancelled | shares |  |  |  |  | (242,492) | (3,487,064) | (345,104)
Outstanding at end of year (in shares) | shares |  |  | 4,986,078 |  | 591,398 | 833,890 | 4,320,954
Vested and exercisable (in shares) | shares |  |  |  |  | 591,398 | 833,890 | 4,298,787
Weighted Average Exercise Price |  |  |  |  |  |  |
Outstanding at beginning of year (in dollars per shares) |  |  |  |  | $ 1.23 | $ 1.01 |
Option granted (in dollars per shares) |  |  |  | $ 1.28 |  |  | $ 1.03
Number of Exercise (in dollars per share) |  |  |  |  | 1.75 |  |
Number of Expired, forfeited or cancelled (in dollars per shares) |  |  |  |  |  | 0.96 | 3.73
Outstanding at end of year (in dollars per shares) |  |  | $ 1.18 |  | 0.88 | 1.23 | 1.01
Vested and exercisable (in dollars per share) |  |  |  |  | $ 0.88 | $ 1.23 | $ 0.97
Weighted Average Remaining Life in Years |  |  |  |  |  |  |
Option granted (in years) |  |  |  |  |  |  | 1 year
Outstanding at end of period |  |  | 1 year |  | 0 years | 0 years | 4 months 24 days
Vested and exercisable (in years) |  |  |  |  |  | 0 years | 0 years
Grant Date Fair Value |  |  |  |  |  |  |
Outstanding at beginning of year | $ |  |  |  |  | $ (351,791) | $ 2,980,823 |
Option granted | $ |  |  |  |  |  |  | $ (185,612)
Number of Expired, forfeited or cancelled | $ |  |  |  |  | (253,337) | (3,332,614) | (237,392)
Outstanding at end of year | $ |  |  | $ 3,403,827 |  | (605,128) | (351,791) | 2,980,823
Vested and exercisable | $ |  |  |  |  | $ (605,128) | $ (351,791) | $ 2,646,781
Aggregate Intrinsic Value |  |  |  |  |  |  |
Outstanding | $ |  |  | $ 7,954,959 |  |  |  |
2016 Equity Incentive Plan | American depositary shares ("ADS") |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Common stock, dividends declared (in dollars per share) | $ 0.40 |  |  |  |  |  |

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