Employee and Consultant Equity-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Option Activity

The following table summarizes option activity under all plans during the years ending December 31, 2015 and December 31, 2014 and shows the exercisable shares as of December 31, 2015:

Stock Option Activity
	Number of Shares		Weighted Average Exercise Price per Share
Options Outstanding January 1, 2014	5,185,086		$	3.45
Granted	769,055		16.22
Forfeited	(13,678	)	13.06
Exercised	(311,737	)	2.96
Expired	—		—
Options Outstanding December 31, 2014	5,628,726		5.20
Granted	717,833		20.59
Forfeited	(54,505	)	11.71
Exercised	(124,884	)	6.44
Expired	—		—
Options Outstanding December 31, 2015	6,167,170		6.91
Exercisable December 31, 2015	1,536,520		7.11

Black-Scholes Assumptions for Option Granted

The table below summarizes the resulting weighted average inputs used to calculate the estimated fair value of options awarded for during the periods shown below:

Black-Scholes Assumptions for Option Granted
	12 months			12 months			12 months
	12/31/2015			12/31/2014			12/31/2013
Expected term (in years)	6.26			6.25			6.28
Volatility	91		%	96		%	97		%
Expected dividends	—			—			—
Risk free interest rates	1.7		%	1.9		%	1.5		%
Estimated forfeitures	5.6		%	0.4		%	14.0		%
Weighted average fair value	$	16.69		$	12.63		$	6.05

Stock Option Supplemental Information

The following table shows summary information for outstanding options, options that are exercisable (vested) and outstanding options that are either vested or expected to vest as of December 31, 2015:

Stock Option Supplemental Information
	Options Outstanding		Options Exercisable		Options Vested and Expected to Vest
Number of options	6,167,170		1,536,520		6,088,562
Weighted average remaining contractual term (in years)	7.19		7.18		7.18
Weighted average exercise price	$	6.91	$	7.11	$	6.80
Weighted average fair value	$	5.43	$	5.48	$	5.34
Aggregate intrinsic value (in thousands)	$	86,102	$	21,734	$	85,804

Restricted Stock Activity

The following table summarizes restricted stock activity during the years ending December 31, 2015 and December 31, 2014:

Restricted Stock Activity
	Number of Shares	Weighted Average Grant Date Fair Value per Share
Restricted stock outstanding December 31, 2014	—	—
Granted	40,250	20.91
Forfeited	—	—
Vested/released	—	—
Restricted stock outstanding December 31, 2015	40,250	20.91

Equity-Based Compensation Expense and Tax Benefit

The expense and tax benefits recognized on Company’s Statements of Operations and Comprehensive Loss related to options is summarized below (in thousands):

Equity-Based Compensation Expenses and Tax Benefit (in thousands)
	12 months		12 months		12 months
	12/31/2015		12/31/2014		12/31/2013
Research and development	$	2,479	$	4,334	$	1,655
Sales, general and administrative	5,909		5,290		2,173
Equity-based compensation expense	8,388		9,624		3,828
Recognized tax benefit	$	—	$	—	$	—