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Financial Statement Schedule I - Condensed Financial Information of Parent Company Statements of Cash Flows (Details)
¥ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2018
CNY (¥)
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
Loss from investment in subsidiaries   136 20 (1,710) 4,890
Prepaid expenses and other current assets   (39,769) (5,712) (92,291) (30,222)
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
Net cash generated from/(used in) operating activities   (533,547) (76,638) 180,543 819,538
CASH FLOWS FROM INVESTING ACTIVITIES          
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
Loan to employees   (33,085) (4,752)    
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
Proceeds from initial public offering, Net of issuance cost of 80,128 ¥ 1,109,517     1,109,517  
Capital contribution from Series B and B+ convertible redeemable preferred shareholders         732,709
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
Parent Company          
CASH FLOWS FROM OPERATING ACTIVITIES          
Net loss   (394,817) (56,713) (926,886) (918,714)
Adjustments to reconcile net loss to net cash generated from operating activities:          
Share-based compensation   2,970 427 3,851 288,763
Loss from investment in subsidiaries   413,496 59,395 1,032,235 813,313
Amounts due to subsidiaries   (398,587) (57,253) (185,537) (751,735)
Prepaid expenses and other current assets   18,032 2,594 (19,276)  
Other non-current assets   (3,394) (488) 11,228  
Accrued expenses and other current liabilities   1,531 220 4,231 75
Net cash generated from/(used in) operating activities   (360,769) (51,818) (80,154) (568,298)
CASH FLOWS FROM INVESTING ACTIVITIES          
Purchase of short-term investments       (814,539)  
Proceeds from maturity of short-term investments   436,228 62,660 396,852  
Loan to employees   (26,849) (3,857)    
Net cash (used in) / generated from investing activities   409,379 58,803 (417,687)  
CASH FLOWS FROM FINANCING ACTIVITIES          
Amounts due from related parties       245,654  
Payment for share repurchase   (31,650) (4,546) (33,971)  
Proceeds from initial public offering, Net of issuance cost of 80,128       1,109,517  
Capital contribution from Series B and B+ convertible redeemable preferred shareholders         732,709
Net cash generated from / (used in) financing activities   (31,650) (4,546) 1,321,200 732,709
Effect of exchange rate changes   21,567 3,095 107,510 (8,759)
Net increase in cash and cash equivalents   38,527 5,534 930,869 155,652
Cash and cash equivalents at beginning of the year   1,086,521 156,069 155,652  
Cash and cash equivalents at end of the year   ¥ 1,125,048 $ 161,603 ¥ 1,086,521 ¥ 155,652