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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Stockholders' Equity

Summary of deferred compensation amounts

        The following table summarizes the deferred compensation amounts under the Deferral Plan as of December 31, 2017 and 2016, respectively (in thousands):

		Year ended December 31,
		2017			2016
Deferred compensation investment		$	2,248		$	1,469
Deferred compensation liability		$	2,258		$	1,479
Investment income		$	66		$	34
Unrealized gain		$	92		$	32

Schedule of fair value weighted-average assumptions

		Years Ended December 31,
		2017			2016			2015
Expected stock price volatility			82.8	%		81.3	%		75.9	%
Risk free interest rate			2.0	%		1.5	%		1.7	%
Expected life of options (years)			6.18			6.25			6.25
Expected annual dividend per share		$	0.00		$	0.00		$	0.00

Summary of stock options outstanding

Number of Shares

Weighted Average Exercise Price

Weighted Average Remaining Contractual Life

Aggregate Intrinsic Value

(in thousands)

(in millions)

Options outstanding, December 31, 2014

10,020.7

$

5.02

Granted

3,917.2

$

11.61

Exercised

(2,070.3

)

$

5.43

Forfeited

(138.4

)

$

7.76

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Options outstanding, December 31, 2015

11,729.2

$

7.11

Granted

5,114.1

$

7.67

Exercised

(723.1

)

$

4.20

Forfeited

(622.7

)

$

8.62

​

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Options outstanding, December 31, 2016

15,497.5

$

7.37

Granted

3,695.3

$

7.17

Exercised

(2,878.7

)

$

5.67

Forfeited

(1,133.0

)

$

9.55

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​

Options outstanding, December 31, 2017

15,181.1

$

7.48

7.2 years

$

105.8

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Vested and unvested expected to vest, December 31, 2017

14,398.5

$

7.45

7.1 years

$

100.9

Exercisable at December 31, 2017

7,985.6

$

7.05

6.0 years

$

59.1

Summary of non-vested Restricted Stock Units activity

Number of Share

Weighted Average Grant Date Fair Value

Weighted Average Remaining Years

Aggregate Intrinsic Value

(in thousands)

(in millions)

Non-vested units as of December 31, 2015

478.5

$

10.38

Granted

582.7

$

6.21

Vested

(281.9

)

$

8.73

Forfeited

(34.9

)

$

7.71

​

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​

Non-vested units as of December 31, 2016

744.4

$

7.86

Granted

2,348.7

$

5.69

Vested

(318.2

)

$

9.23

Forfeited

(199.8

)

$

6.24

​

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Non-vested units as of December 31, 2017

2,575.1

$

5.85

2.47

$

37.1

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Summary of the equity-based compensation expense recognized in the statements of operations

        The following table summarizes the equity-based compensation expense recognized in the statements of operations (in thousands):

		Years Ended December 31,
		2017			2016			2015
Equity compensation expense recognized in:
Research and development expense		$	10,328		$	8,071		$	4,600
Selling, general and administrative expense			12,773			9,433			5,372
​	​	​	​	​	​	​	​	​	​	​
Total equity compensation expense		$	23,101		$	17,504		$	9,972
​	​	​	​	​	​	​	​	​	​	​
​	​	​	​	​	​	​	​	​	​	​

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