Revenues and Deferred Revenue (Tables)

12 Months Ended

Dec. 31, 2019

disaggregated revenues by types were as follows:

	Years ended December 31,
	2017			2018			2019
	RMB			RMB			RMB
Disaggregation of revenues
Revenue by types:
Gross revenues:
Degree- or diploma-oriented post-secondary courses		822,832			1,814,178			2,021,990
Professional certification preparation and professional skills courses		145,840			161,366			155,370
Subtotal Online educational courses		968,672			1,975,544			2,177,360
Commissions		4,105			6,374			15,381
Others		1,901			587			8,100
Total revenues		974,678			1,982,505			2,200,841
Less: sales tax and surcharges		(4,516	)		(8,520	)		(6,939	)
Total net revenues		970,162			1,973,985			2,193,902

The movements of the deferred revenue for the years ended December 31, 2018 and 2019 were as follows ⁽¹⁾:

	As of December 31,
	2018			2019
	RMB			RMB
Beginning balance (current and noncurrent)		2,110,428			3,286,025
Additions		3,214,400			2,236,638
Deductions		(2,038,803	)		(2,293,893	)
Ending balance (current and noncurrent)		3,286,025			3,228,770
Deferred revenue, current		1,765,085			1,670,076
Deferred revenue, non-current		1,520,940			1,558,694

(1)

Amounts presented are inclusive of VAT (see VAT in Note 2).