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Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock Options and Awards |
| December 31,
| 2017
Common stock shares available for grant | 3,254,051 |
Standard and market condition based stock options outstanding | 3,550,072 |
Restricted stock awards outstanding | 44,538 |
Restricted stock units outstanding | 508,880 |
Schedule of Employee Stock Purchase Plan | The intrinsic value listed below is calculated as the difference between the market value on the date of purchase and the purchase price of the shares.
| Year Ended December 31, 2017
Shares purchased under ESPP | 48,750 |
Average price of shares purchased under ESPP | $ | 6.74 |
Intrinsic value of shares purchased under ESPP | $ | 136,000 |
Schedule of Standard and Market-based Stock Options Activity | The following table sets forth the summary of the market condition based option activity under the Company’s stock option plans for the years ended December 31, 2017, 2016 and 2015.
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Fair Value Of Options Granted |  | Aggregate Intrinsic Value of Options Exercised (In thousands)
Outstanding at January 1, 2015 | 50,000 |  |  | $ | 11.94 |  |  |  |  |
Granted | 150,000 |  |  | 8.09 |  |  | 3.64 |  |  |
Exercised | — |  |  |  |  |  |  |  |
Forfeited | — |  |  |  |  |  |  |  |
Expired | — |  |  |  |  |  |  |  |
Outstanding at December 31, 2015 | 200,000 |  |  | 9.05 |  |  |  |  |
Granted | 75,000 |  |  | 9.00 |  |  | 3.68 |  |  |
Exercised | — |  |  |  |  |  |  |
Forfeited | (50,000 | ) |  | 11.94 |  |  |  |  |
Expired | — |  |  |  |  |  |  |
Outstanding at December 31, 2016 | 225,000 |  |  | 8.39 |  |  |  |  |
Granted | 120,830 |  |  | 8.65 |  |  | 3.12 |  |  |
Exercised | — |  |  |  |  |  |  |  |
Forfeited | (73,749 | ) |  | 8.64 |  |  |  |  |
Expired | — |  |  |  |  |  |  |  |
Outstanding at December 31, 2017 | 272,081 |  |  | 8.44 |  |  |  |  |
The following table sets forth the summary of standard stock option activity under the Company’s stock option plans for the years ended December 31, 2017, 2016, and 2015:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Fair Value Of Options Granted |  | Aggregate Intrinsic Value of Options Exercised (In thousands)
Outstanding at January 1, 2015 | 3,486,157 |  |  | $ | 8.30 |  |  |  |  |
Granted | 525,840 |  |  | 10.15 |  |  | $ | 4.56 |  |  |
Exercised | (239,071 | ) |  | 6.82 |  |  |  |  | $ | 1,186 |
Forfeited | (116,425 | ) |  | 12.38 |  |  |  |  |
Expired | (59,968 | ) |  | 13.75 |  |  |  |  |
Outstanding at December 31, 2015 | 3,596,533 |  |  | 8.45 |  |  |  |  |
Granted | 815,794 |  |  | 7.85 |  |  | 3.67 |  |  |
Exercised | (395,515 | ) |  | 6.48 |  |  |  |  | 918 |
Forfeited | (344,541 | ) |  | 9.05 |  |  |  |  |
Expired | (251,150 | ) |  | 8.87 |  |  |  |  |
Outstanding at December 31, 2016 | 3,421,121 |  |  | 8.44 |  |  |  |  |
Granted | 489,568 |  |  | 8.48 |  |  | 3.82 |  |  |
Exercised | (70,608 | ) |  | 7.34 |  |  |  |  | 151 |
Forfeited | (361,687 | ) |  | 9.11 |  |  |  |  |
Expired | (200,403 | ) |  | 15.04 |  |  |  |  |
Outstanding at December 31, 2017 | 3,277,991 |  |  | 7.99 |  |  |  |  |
Schedule of Information Regarding Standard and Market Condition Based Stock Options Outstanding | Information regarding standard stock options outstanding at December 31, 2017, 2016, and 2015 is summarized below:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value (In millions)
December 31, 2015 |  |  |  |  |  |  |
Options outstanding | 3,596,533 |  |  | $ | 8.45 |  |  | 4.23 |  | $ | 12.5 |
Options vested and expected to vest using estimated forfeiture rates | 3,452,487 |  |  | 8.36 |  |  | 4.16 |  | 12.3 |
Options exercisable | 2,252,744 |  |  | 7.59 |  |  | 3.56 |  | 9.9 |
December 31, 2016 |  |  |  |  |  |  |
Options outstanding | 3,421,121 |  |  | $ | 8.44 |  |  | 3.99 |  | $ | 9.0 |
Options vested and expected to vest using estimated forfeiture rates | 3,223,919 |  |  | 8.43 |  |  | 3.87 |  | 8.5 |
Options exercisable | 2,131,268 |  |  | 8.22 |  |  | 3.10 |  | 6.4 |
December 31, 2017 |  |  |  |  |  |  |
Options outstanding | 3,277,991 |  |  | $ | 7.99 |  |  | 2.88 |  | $ | 2.2 |
Options vested and expected to vest using estimated forfeiture rates | 3,175,002 |  |  | 7.99 |  |  | 2.78 |  | 2.2 |
Options exercisable | 2,633,990 |  |  | 7.94 |  |  | 2.14 |  | 2.1 |
Information regarding these market condition based stock options outstanding at December 31, 2017, 2016 and 2015 is summarized below:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value (In millions)
December 31, 2015 |  |  |  |  |  |  |
Options outstanding | 200,000 |  |  | $ | 9.05 |  |  | 5.92 |  | $ | 0.5 |
Options vested and expected to vest using estimated forfeiture rates | 184,125 |  |  | 9.12 |  |  | 5.90 |  | 0.5 |
Options exercisable | — |  |  | — |  |  | 0.00 |  | — |
December 31, 2016 |  |  |  |  |  |  |
Options outstanding | 225,000 |  |  | $ | 8.39 |  |  | 5.50 |  | $ | 0.5 |
Options vested and expected to vest using estimated forfeiture rates | 209,141 |  |  | 8.38 |  |  | 5.49 |  | 0.5 |
Options exercisable | 65,625 |  |  | 8.09 |  |  | 5.17 |  | 0.2 |
December 31, 2017 |  |  |  |  |  |  |
Options outstanding | 272,081 |  |  | $ | 8.44 |  |  | 1.91 |  | $ | — |
Options vested and expected to vest using estimated forfeiture rates | 272,081 |  |  | 8.44 |  |  | 1.91 |  | — |
Options exercisable | 272,081 |  |  | 8.44 |  |  | 1.91 |  | — |
Additional Information Regarding Options Outstanding | Additional information regarding standard options outstanding as of December 31, 2017 is as follows:
|  | Options Outstanding |  | Options Exercisable
Range of Exercise Prices |  | Number Outstanding |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Exercise Price
$3.72 - $3.72 |  | 938 |  |  | 1.54 |  | $ | 3.72 |  |  | 938 |  |  | $ | 3.72 |
3.85 - 3.85 |  | 600,000 |  |  | 1.87 |  | 3.85 |  |  | 600,000 |  |  | 3.85 |
4.95 - 6.66 |  | 374,068 |  |  | 4.13 |  | 6.34 |  |  | 263,312 |  |  | 6.23 |
6.86 - 8.09 |  | 405,525 |  |  | 4.66 |  | 7.82 |  |  | 206,030 |  |  | 7.83 |
8.13 - 8.65 |  | 386,949 |  |  | 4.00 |  | 8.54 |  |  | 196,434 |  |  | 8.56 |
8.70 - 9.19 |  | 378,506 |  |  | 2.51 |  | 9.04 |  |  | 279,659 |  |  | 9.10 |
9.20 - 9.20 |  | 44,300 |  |  | 0.54 |  | 9.20 |  |  | 44,300 |  |  | 9.20 |
9.53 - 9.53 |  | 734,000 |  |  | 1.97 |  | 9.53 |  |  | 734,000 |  |  | 9.53 |
9.61 - 12.48 |  | 336,414 |  |  | 2.64 |  | 11.82 |  |  | 292,026 |  |  | 11.92 |
12.49 - 14.02 |  | 17,291 |  |  | 1.02 |  | 13.74 |  |  | 17,291 |  |  | 13.74 |
$3.72 - $14.02 |  | 3,277,991 |  |  | 2.88 |  | $ | 7.99 |  |  | 2,633,990 |  |  | $ | 7.94 |
Additional information regarding market condition based stock options outstanding as of December 31, 2017 is as follows:
| Options Outstanding |  | Options Exercisable
Range of Exercise Prices | Number Outstanding |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price |  | Number Exercisable |  | Weighted Average Exercise Price
$8.09 - $8.09 | 135,000 |  |  | 1.91 |  | $ | 8.09 |  |  | 135,000 |  |  | $ | 8.09 |
8.65 - 8.65 | 84,581 |  |  | 1.91 |  | 8.65 |  |  | 84,581 |  |  | 8.65 |
9.00 - 9.00 | 52,500 |  |  | 1.91 |  | 9.00 |  |  | 52,500 |  |  | 9.00 |
$8.09 - $9.00 | 272,081 |  |  | 1.91 |  | $ | 8.44 |  |  | 272,081 |  |  | $ | 8.44 |
Schedule of Restricted Stock Units Activity | RSU activity for the years ended December 31, 2017, 2016, and 2015 was as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Fair Value of Released RSU’s (In thousands)
Outstanding at January 1, 2015 | 564,891 |  |  |  |  |
Awarded | 281,290 |  |  | $ | 8.16 |  |  |
Released | (299,277 | ) |  |  |  | $ | 2,626 |
Forfeited | (59,481 | ) |  |  |  |
Outstanding at December 31, 2015 | 487,423 |  |  |  |  |
Awarded | 320,880 |  |  | 8.67 |  |  |
Released | (247,556 | ) |  |  |  | 2,118 |
Forfeited | (133,555 | ) |  |  |  |
Outstanding at December 31, 2016 | 427,192 |  |  |  |  |
Awarded | 483,015 |  |  | 8.46 |  |  |
Released | (198,058 | ) |  |  |  | 1,991 |
Forfeited | (203,269 | ) |  |  |  |
Outstanding at December 31, 2017 | 508,880 |  |  |  |  |
Schedule of Information Regarding Restricted Stock Units Outstanding | Information regarding RSU’s at December 31, 2017, 2016, and 2015 is summarized below:
| Number of Shares |  | Weighted Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value (In millions) |  | Fair Value (In millions)
December 31, 2015 |  |  |  |  |  |  |
RSUs outstanding | 487,423 |  |  | 0.90 |  | $ | 5.7 |  |  | $ | 5.7 |
RSUs vested and expected to vest using estimated forfeiture rates | 414,934 |  |  | 0.87 |  | 4.8 |  |  |
December 31, 2016 |  |  |  |  |  |  |
RSUs outstanding | 427,192 |  |  | 0.93 |  | $ | 4.5 |  |  | $ | 4.5 |
RSUs vested and expected to vest using estimated forfeiture rates | 349,759 |  |  | 0.80 |  | 3.7 |  |  |
December 31, 2017 |  |  |  |  |  |  |
RSUs outstanding | 508,880 |  |  | 1.30 |  | 3.6 |  |  | $ | 3.6 |
RSUs vested and expected to vest using estimated forfeiture rates | 414,847 |  |  | 1.16 |  | 2.9 |  |  |
Schedule of Restricted Stock Awards Activity | Restricted stock award activity for the years ended December 31, 2017, 2016, and 2015 was as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Total Fair Value of Awards Released (In thousands)
Outstanding at January 1, 2015 | 35,364 |  |  | $ | 10.97 |  |  |
Awarded | 21,356 |  |  | 12.26 |  |  |
Released | (35,364 | ) |  | 10.97 |  |  | $ | 434 |
Forfeited | — |  |  |  |  |
Outstanding at December 31, 2015 | 21,356 |  |  | 12.26 |  |  |
Awarded | 77,540 |  |  | 6.52 |  |  |
Released | (21,356 | ) |  | 12.26 |  |  | 139 |
Forfeited | — |  |  |  |  |
Outstanding at December 31, 2016 | 77,540 |  |  | 6.52 |  |  |
Awarded | 44,538 |  |  | 8.65 |  |  |
Released | (77,540 | ) |  | 6.52 |  |  | 671 |
Forfeited | — |  |  |  |  |
Outstanding at December 31, 2017 | 44,538 |  |  | 8.65 |  |  |
Schedule of Stock Options, Market Condition Based Stock Options and Employee Stock Purchase Plan, Valuation Assumptions | The assumptions used to value option grants under the Company’s stock plans are as follows:
| Standard Stock Options
| 2017 |  | 2016 |  | 2015
Expected life (in years) | 4.6 |  |  | 4.5 |  |  | 4.7 |
Interest rate | 2.0 | % |  | 1.2 | % |  | 1.4 | %
Volatility | 52 | % |  | 56 | % |  | 56 | %
Dividend yield | — | % |  | — | % |  | — | %
| Market Condition Based Stock Options
| 2017 |  | 2016 |  | 2015
Expected life (in years) | 7.0 |  |  | 7.0 |  |  | 7.0 |
Interest rate | 2.0 | % |  | 1.6 | % |  | 1.9 | %
Volatility | 55 | % |  | 59 | % |  | 65 | %
Dividend yield | — | % |  | — | % |  | — | %
| Employee Stock Purchase Plan
| 2017 |  | 2016 |  | 2015
Expected life (in years) | 0.5 |  |  | 0.5 |  |  | 0.5 |
Interest rate | 0.9 | % |  | 0.4 | % |  | 0.1 | %
Volatility | 48 | % |  | 53 | % |  | 48 | %
Dividend yield | — | % |  | — | % |  | — | %
Schedule of Stock-Based Compensation | Total stock-based compensation recognized in the consolidated statements of income is as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Income Statement Classifications | (In thousands)
Sales and marketing | $ | 1,025 |  |  | $ | 1,280 |  |  | $ | 1,116 |
Research and development | 981 |  |  | 1,297 |  |  | 1,303 |
General and administrative | 4,096 |  |  | 3,534 |  |  | 3,051 |
Total | $ | 6,102 |  |  | $ | 6,111 |  |  | $ | 5,470 |

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