Revenues and Deferred Revenue (Tables)

12 Months Ended

Dec. 31, 2018

Disaggregation Of Revenue [Abstract]

Schedule of Disaggregation of Revenue

disaggregated revenues by types and models were as follows:

	For the years ended December 31,
	2016			2017			2018
	RMB			RMB			RMB
Disaggregation of revenues
Revenue by types:
Gross revenues:
Degree- or diploma-oriented post-secondary courses		296,269			822,832			1,814,178
Professional certification preparation and professional skills courses		122,005			145,840			161,366
Subtotal Online educational courses		418,274			968,672			1,975,544
Commissions		4,528			4,105			6,374
Others		1,284			1,901			587
Total revenues		424,086			974,678			1,982,505
Less: sales tax and surcharges		(5,176	)		(4,516	)		(8,520	)
Total net revenues		418,910			970,162			1,973,985
Revenue by models:
Gross revenues:
Refundable		79,541			126,277			85,630
Non-refundable		338,733			842,395			1,889,914
Subtotal Online educational courses		418,274			968,672			1,975,544
Commissions		4,528			4,105			6,374
Others		1,284			1,901			587
Total revenues		424,086			974,678			1,982,505
Less: sales tax and surcharges		(5,176	)		(4,516	)		(8,520	)
Total net revenues		418,910			970,162			1,973,985

Schedule of Movements of the Deferred Revenue

The movements of the deferred revenue for the years ended December 31, 2017 and 2018 were as follows ⁽¹⁾:

	As of December 31,
	2017			2018
	RMB			RMB
Beginning balance (current and noncurrent)		727,569			2,110,428
Additions		2,381,755			3,214,400
Deductions		(998,896	)		(2,038,803	)
Ending balance (current and noncurrent)		2,110,428			3,286,025
Deferred revenue, current		1,325,954			1,765,085
Deferred revenue, non-current		784,474			1,520,940

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