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Equity Plans and Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share Based Compensation [Abstract]

Option Activity under Stock-Based Compensation Plans

Activity under our stock plans is set forth below:

		Shares Underlying Outstanding Options (in thousands)				Weighted-Average Exercise Price Per Share				Weighted-Average Remaining Contractual Term (years)				Aggregate Intrinsic Value (in thousands)
Balance at December 31, 2019			8,006			$	13.86
Options granted			2,003				5.76
Options exercised			(72	)			4.20
Options cancelled:
Options forfeited (unvested)			(356	)			7.24
Options expired (vested)			(1,076	)			19.75
Balance at December 31, 2020			8,505			$	11.57				4.25			$	616
Vested and expected to vest at    December 31, 2020			8,314			$	11.69				4.21			$	607
Exercisable at December 31, 2020			5,551			$	14.13				3.35			$	516

Summary of Non-vested Restricted Stock Units Activity

Our non-vested stock awards are comprised of restricted stock units granted with performance and time-based vesting criteria. A summary of the status of non-vested restricted stock units as of December 31, 2020, and activities during 2020 are summarized as follows:  

	Number of Shares (In thousands)				Weighted-Average Grant-Date Fair Value
Non-vested as of December 31, 2019		1,784			$	9.16
Granted		1,412				5.64
Vested		(1,139	)			8.18
Forfeited		(263	)			7.68
Non-vested as of December 31, 2020		1,794			$	7.23

Fair Value-Based Measurements and Weighted-Average Assumptions

The fair value of each option is estimated on the date of grant using the Black-Scholes option valuation model and the following weighted-average assumptions:

		Stock Options												Employee Stock Purchase Plan
		Year Ended December 31,												Year Ended December 31,
		2020				2019				2018				2020				2019				2018
Weighted-average fair value		$	3.91			$	4.58			$	10.75			$	2.82			$	2.72			$	8.30
Risk-free interest rate			1.0	%			2.1	%			2.5	%			0.9	%			1.9	%			2.4	%
Expected life (in years)			4.5				4.5				4.2				1.2				1.2				1.3
Expected Volatility			0.9				0.9				0.8				0.7				0.7				1.1

Stock-Based Compensation Expense

We recognized the following amounts of stock-based compensation expense (in thousands):

		Year Ended December 31,
		2020				2019				2018
Employees and directors stock-based compensation expense		$	13,484			$	25,456			$	23,478
		Year Ended December 31,
		2020				2019				2018
Research and development		$	1,000			$	8,058			$	9,604
Selling, general and administrative			9,585				10,224				11,761
Cost of sales - product			619				1,088				1,354
Inventory			2,280				1,964				759
Restructuring			-				4,122				-
Total		$	13,484			$	25,456			$	23,478

X

- Definition

Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit.

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- Definition

Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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