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Stock Plans (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Stock-based Compensation

The following table summarizes stock-based compensation expense related to all of the Company’s stock awards included by operating expense categories, as follows:

									Twelve Months Ended December 31,
																					2020						2019						2018
Cost of revenues																					$	2,409					$	2,929					$	4,370
Research and development																					4,380						4,227						6,055
Selling, general and administrative																					4,348						15,094						17,179
Total stock-based compensation expense																					$	11,137					$	22,250					$	27,604

The following table summarizes stock-based compensation expense related to all of the Company’s stock awards included by award types, as follows:

									Twelve Months Ended December 31,
																					2020						2019						2018
Stock options																					$	1,308					$	7,348					$	7,368
Restricted stock awards																					9,743						14,775						20,216
Performance Based Cash Units																					86						127						20
Total stock-based compensation before taxes																					11,137						22,250						27,604
Tax benefit																					$	1,815					$	3,455					$	5,387

Schedule of Fair Value Assumptions

The weighted-average assumptions used in the Black-Scholes option pricing model are as follows: 

												Twelve Months Ended December 31,
																								2020						2019						2018
Expected stock price volatility																								74.5		%				69.6		%				65.5		%
Risk-free interest rate																								1.0		%				1.9		%				2.6		%
Expected life of options (in years)																								4.47						4.34						4.13
Expected dividend yield																								0.0		%				0.0		%				0.0		%
Weighted-average fair value (PSV) of the options																								$	2.79					$	3.82					$	4.91

Schedule of Information about Stock Options Outstanding

The following table summarizes information about stock options outstanding as of December 31, 2020: 

Options						Number of Options						Weighted-Average Exercise Price						Weighted-Average Remaining Contractual Term (Years)						Aggregate Intrinsic Value
Outstanding at December 31, 2019						4,922						$	14.54
Options Granted						2,315						4.84
Options Exercised						—						—
Options Cancelled						(2,814)						14.32
Outstanding at December 31, 2020						4,423						$	9.60					4.57						$	788,413.19
Vested at December 31, 2020						1,809						$	15.38					2.59						$	—
Exercisable at December 31, 2020						1,809						$	15.38					2.59						$	1,547.85

Schedule of Unvested Restricted Stock and Performance Shares Activity

A summary of the Company’s unvested restricted stock at December 31, 2020, and changes during the year ended December 31, 2020, is presented below:

Unvested Restricted Stock						Number of Awards						Weighted- Average Grant Date Fair Value
Unvested at December 31, 2019						3,375						$	8.68
Granted						301						4.90
Vested						(1,341)						9.11
Forfeited						(825)						7.79
Unvested at December 31, 2020						1,510						$	7.05

A summary of the Company’s unvested performance-based cash units at December 31, 2020 and changes during the year ended December 31, 2020, is presented below:

Unvested Cash Units						Number of Awards						Period end Fair Value
Unvested at December 31, 2019						1,046						$	4.75
Granted						1,391						—
Vested						—						—
Forfeited						(1,530)						—
Unvested at December 31, 2020						907						$	4.70

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

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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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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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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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