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Fair Value Measurements - Level 3 (Details) - Warrant liability - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value Measurements    
Beginning balance ¥ 9,064  
Change in fair value   ¥ 8,668
Transfer to mezzanine equity (8,982)  
Foreign exchange effect ¥ (82) 396
Ending balance   ¥ 9,064