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Fair Value Measurements - Fair value hierarchy (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value Measurements
Impairment charge	¥ 0	¥ 10,000	¥ 0
Non-recurring | Long-term investment included in other non-current assets
Fair Value Measurements
Assets fair value		10,000
Unobservable Inputs (Level 3) | Recurring | Warrant liability
Fair Value Measurements
Liabilities fair value			¥ 9,064
Unobservable Inputs (Level 3) | Non-recurring | Long-term investment included in other non-current assets
Fair Value Measurements
Assets fair value		¥ 5,000

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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+ References

No definition available.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

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-Topic 320
-SubTopic 10
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Fair value of financial and nonfinancial obligations.

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