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Stock Plans (Tables) | 12 Months Ended
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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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