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v3.3.1.900

Stock award plan (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 05, 2013 | May. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stock option plan |  |  |  |  |
Additional compensation recognized due to modifications to the options granted |  |  |  | $ 1,900 | $ 600
Stock option |  |  |  |  |
Number of options |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  | 3,432,972 | 2,095,592 | 42,394
Granted (in shares) |  |  | 2,201,800 | 1,639,996 | 2,117,113
Exercised (in shares) |  |  | (656,248) | (108,645) |
Forfeited (in shares) |  |  | (152,047) | (193,971) | (63,915)
Outstanding at the end of the period (in shares) |  |  | 4,826,477 | 3,432,972 | 2,095,592
Vested or expected to vest at the end of the period (in shares) |  |  | 3,266,769 |  |
Exercisable at the end of the period (in shares) |  |  | 1,357,478 |  |
Weighted-average exercise price |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  | $ 25.00 | $ 20.24 | $ 474.00
Granted (in dollars per share) |  |  | 50.81 | 31.09 | 11.29
Exercised (in dollars per share) |  |  | 13.27 | 11.00 |
Forfeited (in dollars per share) |  |  | 49.58 | 32.91 | 12.57
Outstanding at the end of the period (in dollars per share) |  |  | 37.20 | $ 25.00 | $ 20.24
Vested or expected to vest at the end of the period (in dollars per share) |  |  | 40.14 |  |
Exercisable at the end of the period (in dollars per share) |  |  | $ 29.38 |  |
Weighted-average remaining contractual term |  |  |  |  |
Outstanding at the end of the period |  |  | 8 years 4 months 17 days |  |
Vested or expected to vest at the end of the period |  |  | 8 years 7 months 24 days |  |
Exercisable at the end of the period |  |  | 7 years 8 months 1 day |  |
Aggregate intrinsic value |  |  |  |  |
Outstanding at the end of the period (in dollars) |  |  | $ 32,391 |  |
Vested or expected to vest at the end of the period (in dollars) |  |  | 13,590 |  |
Exercisable at the end of the period (in dollars) |  |  | $ 18,242 |  |
Valuation assumptions |  |  |  |  |
Expected dividend yield (as a percent) |  |  | 0.00% | 0.00% | 0.00%
Weighted average grant date fair value (in dollars per share) |  |  | $ 50.81 | $ 22.39 | $ 8.23
Stock option | Minimum |  |  |  |  |
Stock option plan |  |  |  |  |
Vesting period |  |  | 3 years |  |
Valuation assumptions |  |  |  |  |
Risk-free interest rate (as a percent) |  |  | 1.48% | 0.11% | 0.85%
Expected volatility (as a percent) |  |  | 67.00% | 70.00% | 87.00%
Expected term |  |  | 5 years 6 months | 5 years 6 months | 6 years
Stock option | Maximum |  |  |  |  |
Stock option plan |  |  |  |  |
Vesting period |  |  | 4 years |  |
Valuation assumptions |  |  |  |  |
Risk-free interest rate (as a percent) |  |  | 2.18% | 2.04% | 1.90%
Expected volatility (as a percent) |  |  | 69.00% | 91.00% | 89.00%
Expected term |  |  | 9 years 1 month 13 days | 6 years 3 months | 6 years 3 months
2009 Equity and Long Term Incentive Plan |  |  |  |  |
Stock option plan |  |  |  |  |
Number of shares available for issuance |  | 0 |  |  |
Number of additional shares authorized |  | 2,500,000 |  |  |
2009 Equity and Long Term Incentive Plan | Stock option | Minimum |  |  |  |  |
Stock option plan |  |  |  |  |
Stock options granted, exercise price as percentage of the fair market value of common stock at grant date |  |  | 100.00% |  |
Stock options granted to stockholder with specified ownership percentage, exercise price as percentage of the fair market value of common stock at grant date |  |  | 110.00% |  |
Stockholder's specified ownership percentage |  |  | 10.00% |  |
2009 Equity and Long Term Incentive Plan | Stock option | Maximum |  |  |  |  |
Stock option plan |  |  |  |  |
Expiration period |  |  | 10 years |  |
2013 Stock Incentive Plan |  |  |  |  |
Stock option plan |  |  |  |  |
Number of shares available for issuance | 0 |  |  |  |
2013 Stock Incentive Plan | Restricted stock |  |  |  |  |
Stock option plan |  |  |  |  |
Options granted (in shares) | 735,324 |  |  |  |
2013 Stock Incentive Plan | Stock option |  |  |  |  |
Number of options |  |  |  |  |
Granted (in shares) | 4,613 |  |  |  |
2013 Stock Incentive Plan | Common stock |  |  |  |  |
Stock option plan |  |  |  |  |
Number of shares authorized | 739,937 |  |  |  |
2009 Equity and Long Term Incentive Plan and 2013 Stock Incentive Plan | Common stock |  |  |  |  |
Stock option plan |  |  |  |  |
Number of shares available for issuance |  | 122,296 |  |  |
2013 Long Term Incentive Plan | Common stock |  |  |  |  |
Stock option plan |  |  |  |  |
Number of shares available for issuance |  |  | 266,533 |  |
Annual increase in the number of shares outstanding on the first day of the fiscal year (as a percent) |  | 4.00% |  |  |
2013 Long Term Incentive Plan | Common stock | Minimum |  |  |  |  |
Stock option plan |  |  |  |  |
Annual increase in the number of shares on the first day of the fiscal year |  | 2,500,000 |  |  |
2013 Long Term Incentive Plan | Common stock | Maximum |  |  |  |  |
Stock option plan |  |  |  |  |
Number of shares subject to outstanding awards |  | 3,040,444 |  |  |
Inducement grant plan | Stock option |  |  |  |  |
Number of options |  |  |  |  |
Granted (in shares) |  |  | 806,600 |  |
Forfeited (in shares) |  |  | (84,150) |  |
Exercise price |  |  |  |  |
Granted (in dollars per share) |  |  | $ 50.46 |  |

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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=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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=6415400&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 (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Period from grant date that an equity-based award expires, 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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