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Stock-based Compensation (Tables)

9 Months Ended

12 Months Ended

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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Tabular disclosure of the changes in outstanding nonvested restricted stock shares.

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