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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Information Regarding Stock Options Outstanding Stock Options Vested and Expected to Vest and Stock Options Exercisable

Information regarding the Company’s stock options outstanding, stock options vested and expected to vest, and stock options exercisable at December 31, 2017, was as follows (in thousands except weighted average exercise price and contractual term):

		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (Years)				Aggregate Intrinsic Value
Balances at December 31, 2017
Stock options outstanding			17,138			$	4.27				6.3			$	3,691
Stock options vested and expected to vest			16,911				4.27				6.2				3,681
Stock options exercisable			12,109				4.12				5.4				3,487

Recognition of Stock-Based Compensation Expense

Stock-based compensation expense recognized on the Company’s consolidated statements of operations for the years ended December 31, 2017, 2016 and 2015, was as follows (in thousands):

		Year Ended December 31,
		2017				2016				2015
Stock-based compensation expense by caption:
Research and development		$	1,323			$	1,091			$	1,260
Selling, general and administrative			8,032				6,974				5,470
Total stock-based compensation expense		$	9,355			$	8,065			$	6,730

Weighted Average Assumptions Used to Value Stock-Based Awards

The weighted average assumptions used to value the Company’s stock-based awards for the years ended December 31, 2017, 2016 and 2015, was as follows:

		Year Ended December 31,
		2017				2016				2015
Stock Options:
Expected term (in years)			6.12				5.85				5.66
Estimated volatility		47%				49%				56%
Risk-free interest rate		2.14%				1.41%				1.55%
Expected dividend yield		0%				0%				0%
Employee Stock Purchase Plan Rights:
Expected term (in years)			0.92				0.76				0.75
Estimated volatility		57%				47%				53%
Risk-free interest rate		1.08%				0.55%				0.28%
Expected dividend yield		0%				0%				0%

2008 Equity Incentive Plan

Activity Under Equity Incentive Plans Related to Stock Options

Activity under the Company’s equity incentive plans related to stock options is set forth below (in thousands except per share amounts):

		Number of Options Outstanding				Weighted Average Exercise Price per Share
Balances at December 31, 2016			15,787			$	4.39
Granted			3,304				4.14
Forfeited			(1,087	)			5.18
Expired			(322	)			7.80
Exercised			(544	)			3.11
Balances at December 31, 2017			17,138				4.27

Activity Under Equity Incentive Plans Related to RSUs

Activity under the Company’s equity incentive plans related to RSUs is set forth below (in thousands except per share amounts):

		Number of Shares Outstanding				Weighted Average Grant Date Fair Value per Share
Balances at December 31, 2016			739			$	5.26
Granted			918				4.18
Forfeited			(132	)			4.53
Vested			(269	)			5.35
Balances at December 31, 2017			1,256				4.53

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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