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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2020
Equity [Abstract] |
Summary of Stock Option Activity | The following table summarizes the stock option activity for the nine months ended September 30, 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 |  |  | 316 |  |  | $ | 18.32 |  |  |  |  |
Exercised |  |  | (159 | ) |  | $ | 11.54 |  |  |  |  |
Expired and forfeited |  |  | (740 | ) |  | $ | 21.92 |  |  |  |  |
Balance at September 30, 2020 |  |  | 16,082 |  |  | $ | 20.45 |  |  |  | 7.06 |
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 September 30, |  |  | Nine Months Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Research and development |  | $ | 4,612 |  |  | $ | 4,365 |  |  | $ | 14,580 |  |  | $ | 14,123 |
General and administrative |  |  | 3,277 |  |  |  | 2,939 |  |  |  | 10,012 |  |  |  | 10,333 |
Sales and marketing |  |  | 3,206 |  |  |  | 2,400 |  |  |  | 9,591 |  |  |  | 15,856 |
Total stock-based compensation expense |  | $ | 11,095 |  |  | $ | 9,704 |  |  | $ | 34,183 |  |  | $ | 40,312 |
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:
|  | September 30, |
|  | 2020 |  |  | 2019 |
Risk-free interest rate |  |  | 0.9 | % |  |  | 2.1 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Volatility |  |  | 67.3 | % |  |  | 67.4 | %
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=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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