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CONSOLIDATED STATEMENTS OF CASHFLOWS
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
CASH FLOWS FROM OPERATING ACTIVITIES        
Net loss ¥ (395,165) $ (56,763) ¥ (926,950) ¥ (918,714)
Adjustments to reconcile net loss to net cash generated from operating activities:        
Share-based compensation 2,970 427 3,851 288,763
Depreciation and amortization 37,223 5,347 25,778 8,109
Loss on disposal of property and equipment 1,824 262   120
Loss/(gain) from equity method investments 136 20 (1,710) 4,890
Changes in operating assets and liabilities:        
Prepaid expenses and other current assets (39,769) (5,712) (92,291) (30,222)
Deferred costs (121,668) (17,476) (229,007) (73,032)
Right-of-use asset (38,805) (5,574)    
Deferred tax assets (85,513) (12,283)    
Other non-current assets 3,446 495 (4,286) (7,480)
Accrued expenses and other current liabilities 25,216 3,622 214,697 164,245
Deferred revenue (57,255) (8,224) 1,175,597 1,382,859
Lease liability 49,253 7,075    
Deferred tax liabilities 87,954 12,634    
Other non-current liabilities (3,394) (488) 14,864  
Net cash generated from/(used in) operating activities (533,547) (76,638) 180,543 819,538
CASH FLOWS FROM INVESTING ACTIVITIES        
Payment for equity method investments (10,153) (1,458) (25,000) (8,190)
Purchase of short-term investments (2,108,820) (302,913) (4,352,103) (2,139,097)
Proceeds from maturity of short-term investments 2,905,788 417,390 3,708,810 1,931,027
Acquisition of property and equipment (24,756) (3,556) (517,763) (398,190)
Acquisition of intangible assets (780) (112) (665) (746)
Consideration paid for a business acquisition, net of cash received       (699)
Proceeds from disposal of property and equipment 652 94    
Loan to employees (33,085) (4,752)    
Repayment of loan to employees 700 101    
Net cash (used in) / generated from investing activities 729,546 104,794 (1,186,721) (615,895)
CASH FLOWS FROM FINANCING ACTIVITIES        
Amounts due from related parties     253,672 7,944
Capital contribution from Series B and B+ convertible redeemable preferred shareholders       732,709
Capital contribution from a noncontrolling shareholder       200
Capital withdrew from Series A convertible redeemable preferred shareholders       (285,078)
Capital withdrew from equity shareholders       (30,000)
Repurchase of equity from shareholders       (41,303)
Cash dividend to a Series A convertible redeemable preferred shareholder       (43,000)
Proceeds from initial public offering, net of issuance cost of 80,128     1,109,517  
Payment for share repurchase (31,650) (4,546) (33,971)  
Proceeds from bank loans     260,000  
Repayment of bank loans (32,500) (4,668) (1,875)  
Net cash generated from / (used in) financing activities (64,150) (9,214) 1,587,343 341,472
Effect of exchange rate changes 21,567 3,095 108,186 (8,759)
Net increase in cash and cash equivalents 153,416 22,037 689,351 536,356
Cash and cash equivalents at beginning of the year 1,248,810 179,380 559,459 23,103
Cash and cash equivalents at end of the year 1,402,226 201,417 1,248,810 559,459
Supplemental schedule of non-cash investing activities:        
Payables for leasehold improvement and intangible assets 6,818 979 7,194 2,180
Payables to acquire buildings 61,540 8,840 61,540 ¥ 240,390
Supplemental disclosure of cash flow information:        
Interest paid ¥ 15,316 $ 2,200 ¥ 1,099