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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2020
Equity [Abstract] |
Summary of Stock Option Activity | The following table summarizes the stock option activity for the three months ended March 31, 2020:
|  | Shares (in thousands) |  |  | Weighted- average Exercise Price |  |  | Weighted- average Remaining Contractual Term (Years) |
Balance at December 31, 2019 |  |  | 16,665 |  |  | $ | 20.47 |  |  |  | 7.87 |
Granted |  |  | 187 |  |  | $ | 20.11 |  |  |  |  |
Exercised |  |  | (70 | ) |  | $ | 7.20 |  |  |  |  |
Expired and forfeited |  |  | (272 | ) |  | $ | 22.26 |  |  |  |  |
Balance at March 31, 2020 |  |  | 16,510 |  |  | $ | 20.49 |  |  |  | 7.51 |
Summary of Stock-Based Compensation Expense related to Stock-Based Payment Awards Granted | The following table summarizes stock-based compensation expense related to stock-based payment awards granted pursuant to all of our equity compensation arrangements (in thousands):
|  | Three Months Ended March 31, |
|  | 2020 |  |  | 2019 |
Research and development |  | $ | 5,287 |  |  | $ | 5,324 |
General and administrative |  |  | 3,431 |  |  |  | 3,680 |
Sales and marketing |  |  | 3,256 |  |  |  | 8,898 |
Total stock-based compensation expense |  | $ | 11,974 |  |  | $ | 17,902 |
Summary of Fair Value of Option Grant on Grant Date Using Black-Scholes Option Pricing Model | We estimated the fair value of each option grant on the grant date using the Black-Scholes option pricing model with the following weighted-average assumptions:
|  | March 31, |
|  | 2020 |  |  | 2019 |
Risk-free interest rate |  |  | 1.3 | % |  |  | 2.5 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Volatility |  |  | 66.2 | % |  |  | 68.8 | %
Expected life (years) |  |  | 6 |  |  |  | 6 |

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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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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