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Equity Plans and Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2017 |  |  | 3,555 |  |  | $ | 19.56 |  |  |  |  |  |  |  |  |
Options granted |  |  | 2,503 |  |  |  | 16.30 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (42 | ) |  |  | 11.80 |  |  |  |  |  |  |  |  |
Options cancelled: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options forfeited (unvested) |  |  | (178 | ) |  |  | 14.29 |  |  |  |  |  |  |  |  |
Options expired (vested) |  |  | (88 | ) |  |  | 29.58 |  |  |  |  |  |  |  |  |
Balance at December 31, 2018 |  |  | 5,750 |  |  | $ | 18.20 |  |  |  | 5.47 |  |  | $ | 651 |
Vested and expected to vest at December 31, 2018 |  |  | 5,534 |  |  | $ | 18.28 |  |  |  | 5.44 |  |  | $ | 644 |
Exercisable at December 31, 2018 |  |  | 2,975 |  |  | $ | 19.90 |  |  |  | 4.87 |  |  | $ | 466 |
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, 2018, and activities during 2018 are summarized as follows:
| Number of Shares (In thousands) |  |  | Weighted-Average Grant-Date Fair Value |
Non-vested as of December 31, 2017 |  | 2,443 |  |  | $ | 6.01 |
Granted |  | 458 |  |  |  | 15.98 |
Vested |  | (1,219 | ) |  |  | 5.86 |
Forfeited |  | (88 | ) |  |  | 9.07 |
Non-vested as of December 31, 2018 |  | 1,594 |  |  | $ | 8.82 |
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, |
|  | 2018 |  |  | 2017 |  |  | 2016 |  |  | 2018 |  |  | 2017 |  |  | 2016 |
Weighted-average fair value |  | $ | 10.75 |  |  | $ | 8.27 |  |  | $ | 9.54 |  |  | $ | 8.30 |  |  | $ | 3.05 |  |  | $ | 7.86 |
Risk-free interest rate |  |  | 2.5 | % |  |  | 1.9 | % |  |  | 1.4 | % |  |  | 2.4 | % |  |  | 1.0 | % |  |  | 0.6 | %
Expected life (in years) |  |  | 4.2 |  |  |  | 4.5 |  |  |  | 4.9 |  |  |  | 1.3 |  |  |  | 1.2 |  |  |  | 1.2 |
Expected Volatility |  |  | 0.8 |  |  |  | 0.9 |  |  |  | 0.7 |  |  |  | 1.1 |  |  |  | 1.0 |  |  |  | 0.6 |
Stock-Based Compensation Expense | We recognized the following amounts of stock-based compensation expense (in thousands):
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Employees and directors stock-based compensation expense |  | $ | 23,478 |  |  | $ | 14,917 |  |  | $ | 14,126 |
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Research and development |  | $ | 9,604 |  |  | $ | 7,827 |  |  | $ | 6,742 |
Selling, general and administrative |  |  | 11,761 |  |  |  | 7,090 |  |  |  | 7,384 |
Cost of sales - product |  |  | 1,354 |  |  |  | - |  |  |  | - |
Inventory |  |  | 759 |  |  |  | - |  |  |  | - |
Total |  | $ | 23,478 |  |  | $ | 14,917 |  |  | $ | 14,126 |

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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 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. + 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 (e)(1) -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 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=109197908&loc=d3e5070-113901 + Details
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