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v3.22.1

Significant Accounting Policies, Stock-Based Compensation Expense (Details) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2022 USD ($) Period $ / shares shares | Mar. 31, 2021 USD ($) $ / shares
Stock-based Compensation Expense [Abstract] |  |  |
Non-cash stock-based compensation expense |  | $ 26,236 | $ 37,861
Cost of Sales [Member] |  |  |
Stock-based Compensation Expense [Abstract] |  |  |
Non-cash stock-based compensation expense |  | 160 | 182
Research, Development and Patent Expense [Member] |  |  |
Stock-based Compensation Expense [Abstract] |  |  |
Non-cash stock-based compensation expense |  | 19,082 | 25,899
Selling, General and Administrative Expense [Member] |  |  |
Stock-based Compensation Expense [Abstract] |  |  |
Non-cash stock-based compensation expense |  | 6,994 | $ 11,780
Stock Options [Member] |  |  |
Unrecognized Compensation Expense [Abstract] |  |  |
Unrecognized compensation expense related to non-vested stock options |  | $ 67,700 |
Weighted average period for recognition |  | 1 year 4 months 24 days |
Stock Options [Member] | Employees [Member] |  |  |
Weighted-Average Assumptions [Abstract] |  |  |
Risk-free interest rate |  | 1.70% | 0.50%
Dividend yield |  | 0.00% | 0.00%
Volatility |  | 55.20% | 55.10%
Expected life | [1] | 6 years 3 months 18 days | 4 years 10 months 24 days
Stock Options Granted Prior to January 1, 2022 [Member] |  |  |
Weighted-Average Assumptions [Abstract] |  |  |
Award term |  | 7 years |
Stock Options Granted on January 1, 2022 and Thereafter [Member] |  |  |
Weighted-Average Assumptions [Abstract] |  |  |
Award term |  | 10 years |
ESPP [Member] |  |  |
Weighted-Average Assumptions [Abstract] |  |  |
Risk-free interest rate |  | 0.60% | 0.10%
Dividend yield |  | 0.00% | 0.00%
Volatility |  | 50.20% | 39.10%
Expected life |  | 6 months | 6 months
RSUs [Member] |  |  |
Unrecognized Compensation Expense [Abstract] |  |  |
Unrecognized compensation cost related to non-vested units |  | $ 69,200 |
Weighted average period for recognition |  | 1 year 8 months 12 days |
RSUs [Member] | Board of Directors [Member] | Minimum [Member] |  |  |
RSUs and PRSUs [Abstract] |  |  |
Vesting period |  | 1 year |
RSUs [Member] | Board of Directors [Member] | Maximum [Member] |  |  |
RSUs and PRSUs [Abstract] |  |  |
Vesting period |  | 4 years |
RSUs [Member] | Employees [Member] |  |  |
RSUs and PRSUs [Abstract] |  |  |
Vesting period |  | 4 years |
Weighted-average grant date fair value (in dollars per share) | $ / shares |  | $ 33.08 |
PRSUs [Member] |  |  |
Unrecognized Compensation Expense [Abstract] |  |  |
Unrecognized compensation cost related to non-vested units |  | $ 5,400 |
Weighted average period for recognition |  | 1 year 7 months 6 days |
PRSUs [Member] | Executive Officers [Member] |  |  |
RSUs and PRSUs [Abstract] |  |  |
Number of performance periods | Period |  | 3 |
Vesting period |  | 3 years |
Number of units guaranteed to vest (in shares) | shares |  | 0 |
Weighted-average grant date fair value (in dollars per share) | $ / shares |  | $ 42.28 | $ 77.17
PRSUs [Member] | Executive Officers [Member] | Minimum [Member] |  |  |
RSUs and PRSUs [Abstract] |  |  |
Percentage of units guaranteed to vest |  | 0.00% |
PRSUs [Member] | Executive Officers [Member] | Maximum [Member] |  |  |
RSUs and PRSUs [Abstract] |  |  |
Percentage of units guaranteed to vest |  | 150.00% |
PRSUs [Member] | Executive Officers [Member] | One-Year Period [Member] |  |  |
RSUs and PRSUs [Abstract] |  |  |
Vesting percentage |  | 33.30% |
PRSUs [Member] | Executive Officers [Member] | Two-Year Period [Member] |  |  |
RSUs and PRSUs [Abstract] |  |  |
Vesting percentage |  | 33.30% |
PRSUs [Member] | Executive Officers [Member] | Three-Year Period [Member] |  |  |
RSUs and PRSUs [Abstract] |  |  |
Vesting percentage |  | 33.30% |
[1] | In 2021, our Compensation Committee approved an amendment to the 2011 Equity Incentive Plan, or 2011 Plan, and 2020 Plan, that increased the contractual term of stock options granted under these plans from seven years to ten years for stock options granted on January 1, 2022 and thereafter. We determined that we are unable to rely on our historical exercise data as a basis for estimating the expected life of stock options granted to employees following this change because the contractual term changed and we have no other means to reasonably estimate future exercise behavior. We therefore used the simplified method for determining the expected life of stock options granted to employees in the three months ended March 31, 2022. Under the simplified method, we calculate the expected term as the average of the time-to-vesting and the contractual life of the options. As we gain additional historical information, we will transition to calculating our expected term based on our historical exercise patterns.

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