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Additional Information - Condensed Financial Statements of the Parent Company - Condensed statements of cash flows (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Condensed statements of cash flows        
Net cash used in operating activities $ (13,618) ¥ (88,854) ¥ (161,806) ¥ (53,338)
Cash flows from investing activities:        
Cash received from maturity of time deposits 25,470 166,192    
Net cash (used in)/generated from investing activities 5,777 37,698 (187,548) (20,746)
Cash flows from financing activities:        
Cash payments for repurchase of shares     13,749  
Proceeds from issuance of Series D-1 convertible redeemable preferred shares       151,118
Payment of issuance cost for Series D-1 convertible redeemable preferred shares       (307)
Proceeds from issuance of Series D-2 convertible redeemable preferred shares       359,834
Payment of issuance cost for Series D-2 convertible redeemable preferred share       (1,267)
Proceeds of initial public offering, net of issuance costs       103,372
Net cash generated from/(used in) financing activities (10) (63) (37,245) 562,126
Effect of exchange rate changes on cash, cash equivalents and restricted cash (687) (4,485) 3,490 12,713
Net increase/(decrease) in cash, cash equivalents and restricted cash (8,538) (55,704) (383,109) 500,755
Cash, cash equivalents and restricted cash at beginning of the year 29,954 195,449 578,558 77,803
Cash, cash equivalents and restricted cash at end of the year 21,416 139,745 195,449 578,558
Parent Company [Member] | Reportable Legal Entities Member        
Condensed statements of cash flows        
Net cash used in operating activities (2,087) (13,622) (3,086) (9,640)
Cash flows from investing activities:        
Cash paid for investments in VIE and VIE's subsidiaries (10,119) (66,027) (151,006) (201,744)
Cash payment of time deposits (21,611) (141,016) (69,762)  
Cash payment of bridge loan     (99,148)  
Cash received from maturity of time deposits 25,469 166,192    
Net cash (used in)/generated from investing activities (6,261) (40,851) (319,916) (201,744)
Cash flows from financing activities:        
Cash payments for repurchase of restricted shares from employees     (26,228)  
Cash payments for repurchase of shares     (13,749)  
Cash received from acquisition 204 1,330    
Proceeds from issuance of Series D-1 convertible redeemable preferred shares       151,118
Payment of issuance cost for Series D-1 convertible redeemable preferred shares       (307)
Proceeds from issuance of Series D-2 convertible redeemable preferred shares       359,834
Payment of issuance cost for Series D-2 convertible redeemable preferred share       (1,267)
Proceeds of initial public offering, net of issuance costs       103,372
Cash received from the depositary bank     2,732  
Net cash generated from/(used in) financing activities 204 1,330 (37,245) 612,750
Effect of exchange rate changes on cash, cash equivalents and restricted cash (361) (2,358) 3,313 12,134
Net increase/(decrease) in cash, cash equivalents and restricted cash (8,505) (55,501) (356,934) 413,500
Cash, cash equivalents and restricted cash at beginning of the year   102,002 458,936  
Cash, cash equivalents and restricted cash at end of the year $ 7,127 ¥ 46,501 ¥ 102,002 ¥ 458,936