Redeemable Convertible Preferred Shares - Assumptions to Estimated Fair Value of Warrants (Parenthetical) (Detail)
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Apr. 24, 2014 |
Mar. 31, 2014 |
Mar. 05, 2014 |
| Subscription Rights [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Probability of occurrence of event |
100.00%
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100.00%
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| Series E Warrants [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Probability of occurrence of event |
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100.00%
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| Series E Warrants [Member] | Convertible Redeemable Preferred Shares [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Probability of occurrence of event |
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100.00%
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| Initial Public Offering [Member] | Subscription Rights [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Probability of occurrence of event |
80.00%
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80.00%
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| Initial Public Offering [Member] | Series E Warrants [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Probability of occurrence of event |
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80.00%
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| Initial Public Offering [Member] | Series E Warrants [Member] | Convertible Redeemable Preferred Shares [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Probability of occurrence of event |
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80.00%
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| Liquidation Event [Member] | Subscription Rights [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Probability of occurrence of event |
10.00%
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10.00%
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| Liquidation Event [Member] | Series E Warrants [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Probability of occurrence of event |
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10.00%
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| Liquidation Event [Member] | Series E Warrants [Member] | Convertible Redeemable Preferred Shares [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Probability of occurrence of event |
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10.00%
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| Redemption Event [Member] | Subscription Rights [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Probability of occurrence of event |
10.00%
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10.00%
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| Redemption Event [Member] | Series E Warrants [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Probability of occurrence of event |
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10.00%
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| Redemption Event [Member] | Series E Warrants [Member] | Convertible Redeemable Preferred Shares [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Probability of occurrence of event |
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10.00%
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