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

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition (Details)

v3.8.0.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition (Details)
9 Months Ended
Dec. 31, 2017
Revenue recognition  
Business tax as a percentage of gross revenues 5.00%
VAT rate one as a percentage of gross revenues 3.00%
VAT rate two as a percentage of gross revenues 6.00%
Other revenue - licensing fees from authorized test centers  
Revenue recognition  
Period of revenue recognition 10 years
Test development services | Minimum  
Revenue recognition  
Period for development of tests 2 months
Test development services | Maximum  
Revenue recognition  
Period for development of tests 6 months