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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Stock Option Activity | The following table summarizes the stock option activity for the three months ended June 30, 2019:
|  | Shares (in thousands) |  |  | Weighted- average Exercise Price |  |  | Weighted- average Remaining Contractual Term (Years) |
Balance at December 31, 2018 |  |  | 15,265 |  |  | $ | 18.33 |  |  |  | 6.87 |
Granted |  |  | 455 |  |  | $ | 24.47 |  |  |  |  |
Exercised |  |  | (1,542 | ) |  | $ | 10.52 |  |  |  |  |
Expired and forfeited |  |  | (633 | ) |  | $ | 20.83 |  |  |  |  |
Balance at June 30, 2019 |  |  | 13,545 |  |  | $ | 19.31 |  |  |  | 6.99 |
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 June 30, |  |  | Six Months Ended June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Research and development |  | $ | 4,434 |  |  | $ | 3,115 |  |  | $ | 9,758 |  |  | $ | 6,151 |
General and administrative |  |  | 3,714 |  |  |  | 2,308 |  |  |  | 7,394 |  |  |  | 4,584 |
Sales and marketing |  |  | 4,558 |  |  |  | 2,398 |  |  |  | 13,456 |  |  |  | 4,787 |
Total stock-based compensation expense |  | $ | 12,706 |  |  | $ | 7,821 |  |  | $ | 30,608 |  |  | $ | 15,522 |
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:
|  | June 30, |
|  | 2019 |  |  | 2018 |
Risk-free interest rate |  |  | 2.4 | % |  |  | 2.7 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Volatility |  |  | 68.0 | % |  |  | 71.1 | %
Expected life (years) |  |  | 6 |  |  |  | 6 |
1997 Employee Stock Purchase Plan |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Fair Value of Option Grant on Grant Date Using Black-Scholes Option Pricing Model | We estimated the fair value of each purchase right granted under our 1997 Employee Stock Purchase Plan at the beginning of each new offering period using the Black-Scholes option pricing model with the following weighted-average assumptions:
|  | June 30, |
|  | 2019 |  |  | 2018 |
Risk-free interest rate |  |  | 2.4 | % |  |  | 2.1 | %
Dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Volatility |  |  | 58.4 | % |  |  | 59.8 | %
Expected life (months) |  |  | 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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