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Organization and Principal Activities - Summary of Results of Operations and Cash Flows of VIE (Details)
¥ in Thousands, $ in Thousands
6 Months Ended
Jun. 30, 2021
CNY (¥)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
CNY (¥)
Variable Interest Entity [Line Items]      
Cost of revenues ¥ (40,088) $ (6,209) ¥ (162,014)
Net loss (69,434) (10,754) (91,446)
Net cash provided by operating activities (46,866) (7,259) 39,787
Net cash (used in) / provided by investing activities 32,128 4,976 (167,882)
Net cash (used in) / provided by financing activities (75,623) (11,713) 457
VIE      
Variable Interest Entity [Line Items]      
Revenues 162,605 25,184 253,197
Cost of revenues (34,489) (5,342) (152,732)
Net loss (41,793) (6,473) (69,950)
Net cash provided by operating activities 19,773 3,062 83,618
Net cash (used in) / provided by investing activities 5,768 893 (133,308)
Net cash (used in) / provided by financing activities ¥ 80,000 $ 12,390 ¥ (13,084)