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Share-based compensation - Additional Information (Detail) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 01, 2014 | Sep. 05, 2014 | Jun. 11, 2014 | Nov. 30, 2014 | Apr. 30, 2014 | Nov. 30, 2013 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2015 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted shares expected to vest |  |  |  |  |  |  | 170,545 | 1,440,923 |  | 1,008,645 |
Incremental share-based compensation to be recognized | $ 2,214,000 |  |  |  |  |  |  |  |  |  |
Share options cancelled | 3,776,711 |  |  |  |  |  |  |  |  |  |
Common shares issued |  |  |  | 10,000,000 |  |  |  |  |  |  |
Total fair value, share options vested |  |  |  |  |  |  | $ 6,963,000 | $ 6,831,000 |  |  |
Unrecognized share-based compensation costs |  |  |  |  |  |  | $ 167,000 | $ 1,358,000 |  |  |
Weighted-average vesting period expected to be recognized |  |  |  |  |  |  | 4 years 7 months 20 days | 3 years 2 months 12 days |  |  |
Leading Advice Holdings Limited [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common shares issued |  |  |  |  | 14,195,412 | 9,073,732 |  |  |  |  |
Restricted shares [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted stock granted | 1,505,787 |  |  |  |  |  |  |  |  |  |
Kingsoft Cloud Storage Business [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Replacement award attributable to pre-combination service |  | $ 303,000 |  |  |  |  |  |  |  |  |
Business acquisition date |  |  |  |  |  |  | Sep. 05, 2014 |  |  |  |
Replacement award attributable to post-combination service |  | $ 44,000 |  |  |  |  |  |  |  |  |
2010 share incentive plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock option vesting period, description |  |  |  |  |  |  | Stock options granted to employees and officers vest over a four-year schedule as stated below: (1) One-fourth of the options shall be vested upon the first anniversary of the grant date; (2) The remaining three quarters of the options shall be vested on monthly basis over the next thirty-six months. (1/48 of options shall be vested per month subsequently) |  |  |  |
Number of shares available for grant |  |  |  |  |  |  | 2,627,465 |  |  |  |
Extended maturity date of share options |  |  |  |  |  |  | Jun. 11, 2015 |  |  |  |
Lock-up period for shares from IPO closing date |  |  |  |  |  |  | 6 months |  |  |  |
Incremental share-based compensation to be recognized |  |  | $ 768,000 |  |  |  |  |  |  |  |
2010 share incentive plan [Member] | Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock option vesting period |  |  |  |  |  |  | 32 months |  |  |  |
2010 share incentive plan [Member] | Employees [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated forfeiture rate |  |  |  |  |  |  | 20.00% |  |  |  |
2010 share incentive plan [Member] | Restricted shares [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  |  |  |  |  |  | 2,050,000 | 1,170,000 |  |  |
2010 share incentive plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock option vesting period | 2 years |  |  |  |  |  |  |  |  |  |
2010 share incentive plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock option vesting period | 4 years 6 months |  |  |  |  |  |  |  |  |  |
Number of shares available for grant |  |  |  |  |  |  |  |  |  |  | 26,822,828
2013 Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  |  |  |  |  |  | 8,664,980 | 8,664,980 |  |  |
2013 Plan [Member] | Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted shares expected to vest |  |  |  |  |  |  | 5,098,345 |  |  |  |
Stock option vesting period |  |  |  |  |  |  | 4 years |  |  |  |
Stock option vesting period, description |  |  |  |  |  |  | one-fourth of the restricted shares shall be vested upon the first, second, third, and fourth anniversary of the grant date, respectively. |  |  |  |
2013 Plan [Member] | Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted shares expected to vest |  |  |  |  |  |  | 1,102,430 |  |  |  |
Stock option vesting period |  |  |  |  |  |  | 5 years |  |  |  |
Stock option vesting period, description |  |  |  |  |  |  | one-fifth of the restricted shares shall be vested upon the first, second, third, fourth and fifth anniversary of the grant date, respectively. |  |  |  |
2013 Plan [Member] | Tranche Three [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted shares expected to vest |  |  |  |  |  |  | 854,405 |  |  |  |
Stock option vesting period |  |  |  |  |  |  | 44 months |  |  |  |
Stock option vesting period, description |  |  |  |  |  |  | one-fourth of the restricted shares shall be vested upon the eighth month, and three-fourth of the restricted shares shall be vested during the remaining thirty six months. |  |  |  |
2013 Plan [Member] | Tranche Four [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted shares expected to vest |  |  |  |  |  |  | 689,700 |  |  |  |
Stock option vesting period |  |  |  |  |  |  | 4 years |  |  |  |
Stock option vesting period, description |  |  |  |  |  |  | one-fourth, and one-fourth of the restricted shares shall be vested upon the second, third and fourth anniversary of the grant date, respectively. |  |  |  |
2013 Plan [Member] | Tranche Five [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted shares expected to vest |  |  |  |  |  |  | 640,100 |  |  |  |
Stock option vesting period |  |  |  |  |  |  | 2 years |  |  |  |
Stock option vesting period, description |  |  |  |  |  |  | half of the restricted shares shall be vested upon the first and second anniversary of the grant date, respectively. |  |  |  |
2013 Plan [Member] | Tranche Six [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted shares expected to vest |  |  |  |  |  |  | 160,000 |  |  |  |
Stock option vesting period |  |  |  |  |  |  | 1 year |  |  |  |
Stock option vesting period, description |  |  |  |  |  |  | one-year schedule in which all of the restricted shares shall be vested upon the first anniversary of the grant date. |  |  |  |
2013 Plan [Member] | Tranche Seven [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted shares expected to vest |  |  |  |  |  |  | 120,000 |  |  |  |
2013 Plan [Member] | Restricted shares [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares available for grant |  |  |  |  |  |  | 9,073,732 |  |  |  |
2013 Plan [Member] | Restricted shares [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares available for grant |  |  |  |  |  |  |  |  | 9,073,732 |  |
2014 Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares available for grant |  |  |  |  | 14,195,412 |  |  |  |  |  |
Unrecognized compensation expense relating to the restricted shares |  |  |  |  |  |  | $ 7,448,000 |  |  |  |
Restricted shares issued to non-employees |  |  |  |  |  |  | 60,000 |  |  |  |
2014 Plan [Member] | Senior Officers [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense relating to the restricted shares |  |  |  |  |  |  | $ 1,424,000 |  |  |  |
Restricted shares issued to non-employees |  |  |  |  |  |  | 60,000 |  |  |  |
2014 Plan [Member] | Tranche One [Member] | Certain Officers and Employees [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted shares expected to vest |  |  |  |  |  |  | 9,040,500 |  |  |  |
Stock option vesting period |  |  |  |  |  |  | 5 years |  |  |  |
Stock option vesting period, description |  |  |  |  |  |  | one-fifth of the restricted shares shall be vested upon the first, second, third, fourth and fifth anniversary of the grant date, respectively. |  |  |  |
2014 Plan [Member] | Tranche Two [Member] | Certain Officers and Employees [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted shares expected to vest |  |  |  |  |  |  | 5,400,000 |  |  |  |
Stock option vesting period |  |  |  |  |  |  | 4 years |  |  |  |
Stock option vesting period, description |  |  |  |  |  |  | one-fourth of the restricted shares shall be vested upon the first, second, third and fourth anniversary of the grant date, respectively. |  |  |  |
2014 Plan [Member] | Tranche Three [Member] | Certain Officers and Employees [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted shares expected to vest |  |  |  |  |  |  | 9,000 |  |  |  |
Stock option vesting period |  |  |  |  |  |  | 2 years |  |  |  |
Stock option vesting period, description |  |  |  |  |  |  | half of the restricted shares shall be vested upon the first and second anniversary of the grant date, respectively. |  |  |  |
2014 Plan [Member] | Restricted shares [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  |  |  |  |  |  | 0 | 6,749,000 |  |  |
2014 Plan [Member] | Restricted shares [Member] | Certain Officers and Employees [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted stock granted |  |  |  |  |  |  | 14,536,000 |  |  |  |
2014 Plan [Member] | Restricted shares [Member] | Tranche Four [Member] | Certain Officers and Employees [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted shares expected to vest |  |  |  |  |  |  | 86,500 |  |  |  |

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- Definition Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Date the equity-based award expires, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of new stock issued during the period. + 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 3: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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