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Equity Incentive Plans and Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Summary of Stock-based Compensation | A summary of our stock-based compensation expense is as follows (in thousands):
|  |  | Years Ended December 31,
|  |  |  |  | 2020 |  | 2019 |  | 2018
Stock-based compensation by type of award: |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  | $ | 209 |  |  | $ | 648 |  |  | $ | 1,353 |
Stock awards |  |  |  |  | 10,938 |  |  | 14,882 |  |  | 10,445 |
Employee stock purchase rights (1) |  |  |  |  | 1,163 |  |  | 999 |  |  | 5,240 |
Total |  |  |  |  | $ | 12,310 |  |  | $ | 16,529 |  |  | $ | 17,038 |
Stock-based compensation by category of expense: |  |  |  |  |  |  |  |  |
Cost of revenue |  |  |  |  | $ | 1,357 |  |  | $ | 1,500 |  |  | $ | 1,602 |
Sales and marketing |  |  |  |  | 3,018 |  |  | 5,765 |  |  | 5,667 |
Research and development |  |  |  |  | 4,241 |  |  | 6,039 |  |  | 6,631 |
General and administrative |  |  |  |  | 3,694 |  |  | 3,225 |  |  | 3,138 |
Total |  |  |  |  | $ | 12,310 |  |  | $ | 16,529 |  |  | $ | 17,038 |
(1)Amount for the year ended December 31, 2018 includes $4.1 million of accelerated stock-based compensation expense. In March 2018, as a result of a suspension of the 2014 Purchase Plan due to our non-timely filing status, all unrecognized stock-based compensation expense related to ESPP under the 2014 Purchase Plan was accelerated and recognized within the consolidated statement of operations.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The fair values of stock options and employee stock purchase rights were estimated as of the grant date using the Black-Scholes option-pricing model with the following assumptions:
| Stock Options (1) |  | Employee Stock Purchase Rights
| Year Ended December 31, |  | Years Ended December 31,
| 2018 |  | 2020 |  | 2019 |  | 2018
Expected term (in years) | 4.8 |  | 0.5 |  | 0.5 |  | 0.5
Risk-free interest rate | 3.1% |  | 0.1% |  | 2.3% |  | 2.6%
Expected volatility | 37% |  | 59% |  | 34% |  | 28%
Dividend rate | —% |  | —% |  | —% |  | —%
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block] | The fair values of stock options and employee stock purchase rights were estimated as of the grant date using the Black-Scholes option-pricing model with the following assumptions:
| Stock Options (1) |  | Employee Stock Purchase Rights
| Year Ended December 31, |  | Years Ended December 31,
| 2018 |  | 2020 |  | 2019 |  | 2018
Expected term (in years) | 4.8 |  | 0.5 |  | 0.5 |  | 0.5
Risk-free interest rate | 3.1% |  | 0.1% |  | 2.3% |  | 2.6%
Expected volatility | 37% |  | 59% |  | 34% |  | 28%
Dividend rate | —% |  | —% |  | —% |  | —%
Summary of Activity under Stock Option Plans | The following tables summarize our stock option activities and related information:
| Number of Shares (thousands) |  | Weighted-Average Exercise Price Per Share |  | Weighted-Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (1) (thousands)
Outstanding as of December 31, 2019 | 3,702 |  |  | $ | 5.57 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (1,298) |  |  | 4.85 |  |  |  |  |
Canceled | (731) |  |  | 7.15 |  |  |  |  |
Outstanding as of December 31, 2020 | 1,673 |  |  | $ | 5.44 |  |  | 2.67 |  | $ | 7,520 |
Vested and exercisable as of December 31, 2020 | 1,673 |  |  | $ | 5.44 |  |  | 2.67 |  | $ | 7,520 |
(1)The aggregate intrinsic value represents the excess of the closing price of our common stock of $9.86 as of December 31, 2020 over the exercise price of the outstanding in-the-money options.
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value [Table Text Block] | Following is additional information pertaining to our stock option activities (in thousands, except per share data):
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Weighted-average grant date fair value of options granted (per share) | $ | — |  |  | $ | — |  |  | $ | 2.19 |
Intrinsic value of options exercised (1) | $ | 2,778 |  |  | $ | 1,930 |  |  | $ | 2,629 |
(1)Intrinsic value of options exercised is the difference between the closing price of our common stock at the time of exercise and the exercise price paid.
Summary of Restricted Stock Units Activity | The following table summarizes our stock award activities and related information:
| Number of Shares (thousands) |  | Weighted-Average Grant Date Fair Value Per Share |  | Weighted-Average Remaining Vesting Term (years) |
Nonvested as of December 31, 2019 | 6,148 |  |  | $ | 6.59 |  |  |  |
Granted | 2,018 |  |  | 6.74 |  |  |  |
Released | (1,786) |  |  | 6.79 |  |  |  |
Canceled | (1,492) |  |  | 6.56 |  |  |  |
Nonvested as of December 31, 2020 | 4,888 |  |  | $ | 6.59 |  |  | 2.13 |
Following is additional information pertaining to our stock award activities (in thousands, except per share data):
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Weighted-average grant date fair value of stock awards granted (per share) | $ | 6.74 |  |  | $ | 6.74 |  |  | $ | 5.95 |
Total fair value of stock awards released (vested) during the period | $ | 12,129 |  |  | $ | 12,183 |  |  | $ | 9,714 |

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