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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
CNY (¥)
¥ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
CNY (¥)
¥ / shares
shares
Dec. 31, 2021
CNY (¥)
¥ / shares
shares
Revenues (including transactions with related parties of RMB2,157, RMB1,224 and RMB1,388 (US$196) for the years ended December 31, 2021, 2022 and 2023, respectively)        
Total revenues ¥ 1,018,139 $ 143,402 ¥ 985,517 ¥ 944,722
Cost of revenues (including transactions with related parties of RMB 1,524, RMB 4,708 and RMB 5,277 (US$743) for the years ended December 31, 2021, 2022 and 2023, respectively)        
Total cost of revenues (296,868) (41,813) (294,343) (284,098)
Gross profit 721,271 101,589 691,174 660,624
Operating expenses        
Research and development expenses (including transactions with related parties of RMB 22,416, RMB 18,293 and RMB 16,264 (US$2,291) for the years ended December 31, 2021, 2022 and 2023, respectively) (257,546) (36,275) (313,481) (415,334)
Sales and marketing expenses (including transactions with a related party of RMB 3,797, RMB 4,549 and RMB 5,370 (US$756) for the years ended December 31, 2021, 2022 and 2023, respectively) (199,504) (28,100) (156,916) (202,093)
General and administrative expenses (including transactions with a related party of RMB 3,164, RMB 3,455 and RMB 3,534 (US$498) for the years ended December 31, 2021, 2022 and 2023, respectively) (104,334) (14,695) (109,195) (97,445)
Total operating expenses (561,384) (79,070) (579,592) (714,872)
Operating income (loss) 159,887 22,519 111,582 (54,248)
Other income, net 42,686 6,012 21,190 17,052
Income (loss) before income taxes 202,573 28,531 132,772 (37,196)
Income tax benefits (expenses) (21,666) (3,052) (22,953) 145
Net income (loss) 180,907 25,479 109,819 (37,051)
Other comprehensive income (loss)        
Foreign currency translation adjustment 7,458 1,050 45,174 (12,816)
Total other comprehensive income (loss) 7,458 1,050 45,174 (12,816)
Total comprehensive income (loss) ¥ 188,365 $ 26,529 ¥ 154,993 ¥ (49,867)
Income (loss) per ordinary share:        
Basic | (per share) ¥ 0.69 $ 0.10 ¥ 0.41 ¥ (0.14)
Diluted | (per share) ¥ 0.66 $ 0.09 ¥ 0.41 ¥ (0.14)
Weighted average number of ordinary shares:        
Basic 264,052,936 264,052,936 266,535,220 266,631,802
Diluted 273,765,128 273,765,128 270,204,542 266,631,802
American Depositary Shares        
Income (loss) per ordinary share:        
Basic | (per share) ¥ 3.43 $ 0.48 ¥ 2.06 ¥ (0.69)
Diluted | (per share) ¥ 3.30 $ 0.46 ¥ 2.03 ¥ (0.69)