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Stock-based Compensation (Tables) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2015 | Dec. 31, 2014
STOCK BASED COMPENSATION |  |
Summary of restricted stock awards |
|  | Shares |  | Weighted average purchase price per share |
--- | --- | --- | --- | --- | ---
Unvested at December 31, 2014 |  |  | 15,387 |  | $ | 0.69 |
Granted |  |  | 194,694 |  |  | 5.73 |
Vested |  |  | (128,955 | ) |  | 5.13 |
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Unvested at September 30, 2015(1) |  |  | 81,126 |  | $ | 5.73 |
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(1) Excludes 72,463 shares of unvested restricted stock remaining from the early exercise of stock options as of September 30, 2015. |
|  | Number of Shares |  | Weighted-Average Grant Date Fair Value |
--- | --- | --- | --- | --- | ---
Unvested at December 31, 2012 |  |  | 203,342 |  | $ | 0.62 |
Vesting of restricted stock |  |  | (89,308 | ) |  | 0.55 |
Performance Adjustment |  |  | (58,736 | ) |  | 0.62 |
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Unvested at December 31, 2013 |  |  | 55,298 |  |  | 0.69 |
Grant of restricted stock |  |  | 10,869 |  |  | 1.24 |
Vesting of restricted stock |  |  | (50,780 | ) |  | 0.62 |
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Unvested at December 31, 2014 |  |  | 15,387 |  | $ | 0.69 |
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Summary of stock option activity |
|  | Shares |  | Weighted- average exercise price per share |  | Weighted- average remaining contractual term (years) |  | Aggregate Intrinsic Value |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Outstanding at December 31, 2014 |  |  | 281,029 |  | $ | 0.69 |  |  |  |  |  |  |
Granted |  |  | 1,197,452 |  |  | 10.47 |  |  |  |  |  |  |
Exercised |  |  | (121,729 | ) |  | 3.89 |  |  |  |  |  |  |
Cancelled |  |  | (506 | ) |  | 2.06 |  |  |  |  |  |  |
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Outstanding at September 30, 2015 |  |  | 1,356,246 |  | $ | 9.04 |  |  | 9.2 |  | $ | 17,722 |
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Exercisable at September 30, 2015 |  |  | 208,438 |  | $ | 2.65 |  |  | 7.9 |  | $ | 4,056 |
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Vested and expected to vest at September 30, 2015 |  |  | 1,341,543 |  | $ | 9.13 |  |  | 9.2 |  | $ | 18,595 |
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|  | Number of Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Outstanding at December 31, 2012 |  |  | 323,488 |  | $ | 1.73 |  |  | 6.94 |  | $ | 8 |
Granted |  |  | 146,730 |  |  | 0.48 |  |  |  |  |  |  |
Exercised |  |  | (1,077 | ) |  | 0.62 |  |  |  |  |  |  |
Cancelled |  |  | (9,559 | ) |  | 2.76 |  |  |  |  |  |  |
Modification |  |  | (229,791 | ) |  | 1.17 |  |  |  |  |  |  |
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Outstanding at December 31, 2013 |  |  | 229,791 |  |  | 1.17 |  |  | 7.02 |  |  | 117 |
Granted |  |  | 89,641 |  |  | 0.28 |  |  |  |  |  |  |
Exercised |  |  | (32,390 | ) |  | 2.21 |  |  |  |  |  | — |
Cancelled |  |  | (6,013 | ) |  | 4.42 |  |  |  |  |  |  |
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Outstanding at December 31, 2014 |  |  | 281,029 |  | $ | 0.69 |  |  | 7.49 |  | $ | 1,505 |
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Vested and expected to vest at December 31, 2014 |  |  | 247,139 |  | $ | 0.83 |  |  | 4.31 |  | $ | 1,293 |
Exercisable at December 31, 2014 |  |  | 121,304 |  | $ | 1.38 |  |  | 4.31 |  | $ | 570 |
Schedule of weighted-average assumptions used in Black-Scholes option-pricing model |
|  | Nine months ended September 30, |
--- | --- | --- | ---
|  | 2014 |  | 2015 |
Risk-free interest rate |  |  | 1.8 | % |  | 1.7 | %
Dividend yield |  |  | — |  |  | — |
Volatility |  |  | 77 | % |  | 77 | %
Expected term (years) |  |  | 6.25 |  |  | 6.21 |
|  | Years Ended December 31, |
--- | --- | --- | ---
|  | 2013 |  | 2014 |
Risk-free interest rate |  | 1.09% – 1.22% |  |  | 1.80 | %
Expected volatility |  | 87.8% |  |  | 77.1 | %
Expected term (in years) |  | 6.25 |  |  | 6.25 |
Expected dividend yield |  | 0.0% |  |  | 0.0 | %

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