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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2020
Stockholders' Equity Note [Abstract] |
Stock-based Compensation Expense | The stock-based compensation related to all of our stock-based awards and employee stock purchases for the three months ended March 31, 2020 and 2019 is as follows (in thousands):
|  |  |  |  |  | Three Months Ended March 31, |  |
|  |  |  |  |  | 2020 |  | 2019
Cost of net revenues |  |  |  |  |  | $ | 1,347 |  |  | $ | 1,112 |
Selling, general and administrative |  |  |  |  |  | 18,130 |  |  | 16,890 |
Research and development |  |  |  |  |  | 3,450 |  |  | 3,042 |
Total stock-based compensation |  |  |  |  |  | $ | 22,927 |  |  | $ | 21,044 |
Summary Of Restricted Stock Units | A summary for the three months ended March 31, 2020 is as follows:
| Number of Shares Underlying RSUs (in thousands) |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Unvested as of December 31, 2019 | 696 |  |  | $ | 190.60 |  |  |  |  |
Granted | 251 |  |  | 272.24 |  |  |  |  |
Vested and released | (259) |  |  | 145.91 |  |  |  |  |
Forfeited | (11) |  |  | 233.45 |  |  |  |  |
Unvested as of March 31, 2020 | 677 |  |  | $ | 237.27 |  |  | 1.8 |  | $ | 117,738 |
Summary Of Market-performance Based Restricted Stock Units | A summary for the three months ended March 31, 2020 is as follows:
| Number of Shares Underlying MSUs (in thousands) |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Unvested as of December 31, 2019 | 244 |  |  | $ | 331.35 |  |  |  |  |
Granted | 156 |  |  | 242.04 |  |  |  |  |
Vested and released | (173) |  |  | 120.39 |  |  |  |  |
Unvested as of March 31, 2020 | 227 |  |  | $ | 430.50 |  |  | 1.9 |  | $ | 39,529 |
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions | The fair value of the option component of the 2010 Purchase Plan shares was estimated at the grant date using the Black-Scholes option pricing model with the following weighted average assumptions:
|  |  |  |  | Three Months Ended March 31, |  |
|  |  |  |  | 2020 |  | 2019
Expected term (in years) |  |  |  |  | 1.0 |  | 1.4
Expected volatility |  |  |  |  | 41.7 | % |  | 48.6 | %
Risk-free interest rate |  |  |  |  | 1.5 | % |  | 2.5 | %
Expected dividends |  |  |  |  | — |  |  | — |
Weighted average fair value at grant date |  |  |  |  | $ | 80.54 |  |  | $ | 90.36 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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 employee stock purchase plans, including, but not limited to: (a) expected term, (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=109197908&loc=d3e5070-113901 + Details
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