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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Share Option Activity | The following table summarizes the share option activity for the years ended December 31, 2015, 2016 and 2017:
|  |  |  |  |  |  |  | Weighted |  |  |
|  |  |  |  |  | Weighted- |  | average |  |  |
|  |  |  | Weighted |  | average |  | remaining |  | Aggregate |
|  |  |  | average |  | grant-date |  | contractual |  | intrinsic |
|  | Number of |  | exercise |  | fair |  | life |  | value (In |
|  | share options |  | price (USD) |  | value (USD) |  | (years) |  | thousands) |
Outstanding, December 31, 2015 |  |  | 2,130,820 |  |  | 2.13 |  |  |  |  |  |  |  |  |  |
Vested and expected to vest at December 31, 2015 |  |  | 1,008,645 |  |  | 1.76 |  |  | 0.73 |  |  | 4.62 |  |  | 464 |
Exercisable at December 31, 2015 |  |  | 1,430,870 |  |  | 2.16 |  |  | 0.86 |  |  | 4.03 |  |  | 406 |
Forfeited |  |  | (14,375) |  |  | 3.21 |  |  |  |  |  |  |  |  |  |
Expired |  |  | (182,510) |  |  | 2.22 |  |  |  |  |  |  |  |  |  |
Exercised |  |  | (440,465) |  |  | 1.81 |  |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2016 |  |  | 1,493,470 |  |  | 2.65 |  |  |  |  |  | 3.39 |  |  | 6 |
Vested and expected to vest at December 31, 2016 |  |  | 1,440,923 |  |  | 2.67 |  |  | 0.85 |  |  | 3.24 |  |  | 6 |
Exercisable at December 31, 2016 |  |  | 1,217,050 |  |  | 2.70 |  |  | 0.84 |  |  | 3.20 |  |  | 6 |
Forfeited |  |  | (109,925) |  |  | 2.89 |  |  |  |  |  |  |  |  |  |
Expired |  |  | (989,730) |  |  | 2.28 |  |  |  |  |  |  |  |  |  |
Exercised |  |  | (4,000) |  |  | 0.83 |  |  |  |  |  |  |  |  |  |
Outstanding, December 31, 2017 |  |  | 389,815 |  |  | 3.90 |  |  | — |  |  | 4.64 |  |  | — |
Vested and expected to vest at December 31, 2017 |  |  | 170,545 |  |  | 3.90 |  |  | 0.95 |  |  | 4.64 |  |  | — |
Exercisable at December 31, 2017 |  |  | 389,190 |  |  | 3.90 |  |  | 0.95 |  |  | 4.64 |  |  | — |
Schedule of Fair Values of Stock Options Granted | The fair values of stock options granted during the years ended December 31, 2016 and 2017 were estimated using the following assumptions: Options granted to employees
Years ended December 31, |  | 2016 |  | 2017 |
Risk-free interest rate(1) |  |  | 0.77% to 1.76 | % |  | 0.77% to 1.76 | %
Dividend yield(2) |  |  | — |  |  | — |
Volatility rate(3) |  |  | 40.07% to 43.3 | % |  | 40.07% to 43.3 | %
Expected term (in years)(4) |  |  | 4.06 to 5.56 |  |  | 4.06 to 5.56 |
| (1) | The risk-free interest rate of periods within the contractual life of the share option is based on the USD denominated China Government Bond yield as at the valuation dates.
| (2) | The Company has no history or expectation of paying dividends on its common shares.
| (3) | Expected volatility is estimated based on the average of historical volatilities of the comparable companies in the same industry as at the valuation dates.
| (4) | The expected term is developed by assuming the share options will be exercised in the middle point between the vesting dates and maturity dates.
Schedule of Recognized Compensation Costs | Total compensation costs recognized for the years ended December 31, 2015, 2016 and 2017 are as follows:
|  | Years ended December 31, |
(In thousands) |  | 2015 |  | 2016 |  | 2017 |
Sales and marketing expenses |  |  | 131 |  |  | 98 |  |  | 88 |
General and administrative expenses |  |  | 6,701 |  |  | 6,267 |  |  | 5,800 |
Research and development expenses |  |  | 2,896 |  |  | 2,983 |  |  | 2,442 |
Total |  |  | 9,728 |  |  | 9,348 |  |  | 8,330 |
2013 Plan [Member] |
Summary of Restricted Shares Activities | A summary of the restricted shares activities under the 2010 Plan for the years ended December 31, 2017 is presented below:
|  | Number of restricted shares |  | Weighted-Average Grant-Date Fair Value |
Unvested at January 1, 2016 |  |  | 432,217 |  |  |  |
Granted |  |  | 1,170,000 |  |  | 1.18 |
Vested |  |  | (274,960) |  |  |  |
Forfeited |  |  | (384,037) |  |  |  |
Unvested at December 31, 2016 |  |  | 943,220 |  |  |  |
Vested and expected to vest at December 31, 2016 |  |  | 801,737 |  |  |  |
Granted |  |  | 2,050,000 |  |  | 0.69 |
Vested |  |  | (115,125) |  |  |  |
Forfeited |  |  | (1,605,945) |  |  |  |
Unvested at December 31, 2017 |  |  | 1,272,150 |  |  |  |
Vested and expected to vest at December 31, 2017 |  |  | 1,081,327 |  |  |  |
2010 share incentive plan [Member] |
Summary of Restricted Shares Activities | A summary of the restricted shares activities under the 2013 Plan for the years ended December 31, 2015, 2016 and 2017 is presented below:
|  | Number of restricted shares |
Unvested at January 1, 2015 |  |  | 7,200,778 |
Vested |  |  | (2,627,815) |
Forfeited |  |  | (776,565) |
Unvested at December 31, 2015 |  |  | 3,796,398 |
Vested and expected to vest at December 31, 2015 |  |  | 3,226,939 |
Unvested at January 1, 2016 |  |  | 3,796,398 |
Vested |  |  | (1,520,760) |
Forfeited |  |  | (561,103) |
Unvested at December 31, 2016 |  |  | 1,714,535 |
Vested and expected to vest at December 31, 2016 |  |  | 1,457,355 |
Unvested at January 1, 2017 |  |  | 1,714,535 |
Vested |  |  | (996,835) |
Forfeited |  |  | (129,940) |
Unvested at December 31, 2017 |  |  | 587,760 |
Vested and expected to vest at December 31, 2017 |  |  | 499,596 |
2014 Plan [Member] |
Summary of Restricted Shares Activities | A summary of the restricted shares activities under the 2014 Plan for the years ended December 31, 2016 and 2017 is presented below:
|  | Number of restricted shares |  | Weighted-Average Grant-Date Fair Value |
Unvested at January 1, 2016 |  |  | 5,761,400 |  |  |  |
Granted |  |  | 6,749,000 |  |  | 1.12 |
Vested |  |  | (1,262,200) |  |  |  |
Forfeited |  |  | (971,900) |  |  |  |
Unvested at December 31, 2016 |  |  | 10,276,300 |  |  |  |
Vested and expected to vest at December 31, 2016 |  |  | 8,734,855 |  |  |  |
Unvested at January 1, 2017 |  |  | 10,276,300 |  |  |  |
Granted |  |  | — |  |  |  |
Vested |  |  | (2,447,950) |  |  |  |
Forfeited |  |  | (2,022,000) |  |  |  |
Unvested at December 31, 2017 |  |  | 5,806,350 |  |  |  |
Vested and expected to vest at December 31, 2017 |  |  | 4,935,398 |  |  |  |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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