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Summary of significant accounting policies - Schedule of Balances of Registered Capital, Additional Paid-in-Capital and Statutory Reserves (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Accounting Policies and General Information [Line Items] |  |
Additional paid-in capital | $ 461,330 | $ 453,347
Statutory reserves | 5,132 | 5,132
China [Member] |  |
Accounting Policies and General Information [Line Items] |  |
Paid-in capital | 137,194 | 118,733
Additional paid-in capital | 161 | 161
Statutory reserves | 5,132 | 5,132
Total | $ 142,487 | $ 124,026

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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Accounting Policies and General Information [Line Items] + References No definition available. + Details
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- Definition Amount of paid-in capital of joint ventures, subsidiary and equity investments. + References No definition available. + Details
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- Definition Registered Capital Additional Paid In Capital And Statutory Reserves + References No definition available. + Details
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- Definition Amount set aside as reserve under the statute for the purpose specified under the statute. + References No definition available. + Details
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- Details
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