XML 85 R65.htm IDEA: XBRL DOCUMENT v3.21.1
Income taxes - Schedule of Reconciliation of Federal Statutory Rate to Company's Effective Tax Rate (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2018
Income Tax Disclosure [Abstract]        
Federal statutory rate 21.00% 21.00% 21.00% 21.00%
State tax, net of federal benefit 1.20% (10.60%) 3.70% 2.60%
State tax deferred rate change, net of federal benefit 0.00% (1.60%) 0.10% 0.90%
Nondeductible business expenses (0.10%) 2.10% 0.80% 1.40%
Nondeductible employee compensation 0.00% 9.10% 0.40% 0.00%
Provision-to-return adjustment 0.00% 1.50% 0.00% (3.90%)
Uncertain tax positions (0.10%) 1.00% (0.20%) (1.30%)
Stock based compensation (6.10%) (90.70%) (0.80%) (8.60%)
Others (0.50%) (0.70%) 0.70% 1.40%
Effective tax rate 15.40% (68.90%) 25.70% 13.50%