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Stock Option Plans (Tables) | 12 Months Ended
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Dec. 31, 2016
Stock Option Plans |
Summary of stock option activity |
|  |  |  | Options Outstanding |
|  | Shares Available for Grant |  | Number of Options |  | Weighted- Average Exercise Price |
Balance at December 31, 2015 |  |  | 2,559,499 |  |  | 784,136 |  | $ | 4.09 |
Additional shares authorized |  |  | 1,496,001 |  |  |  |  |  |  |
Options granted |  |  | (1,813,400 | ) |  | 1,813,400 |  |  | 15.09 |
Options exercised |  |  | — |  |  | (13,454 | ) |  | 0.28 |
Options forfeited |  |  | 233,500 |  |  | (233,500 | ) |  | 11.35 |
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Balance at December 31, 2016 |  |  | 2,475,600 |  |  | 2,350,582 |  | $ | 11.88 |
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Summary of information about stock options outstanding |
|  | Options Outstanding at December 31, 2016 |  | Options Vested at December 31, 2016 |
Exercise Price |  | Number |  | Weighted Average Remaining Contractual Life (in Years) |  | Weighted Average Exercise Price |  | Number |  | Weighted Average Remaining Contractual Life (in Years) |  | Weighted Average Exercise Price |
$0.28 |  |  | 419,682 |  |  | 8.46 |  | $ | 0.28 |  |  | 159,732 |  |  | 8.44 |  | $ | 0.28 |
$4.65 |  |  | 144,500 |  |  | 8.81 |  | $ | 4.65 |  |  | 42,449 |  |  | 8.81 |  | $ | 4.65 |
$6.75 |  |  | 5,000 |  |  | 8.87 |  | $ | 6.75 |  |  | 1,438 |  |  | 8.87 |  | $ | 6.75 |
$13.34 - 16.37 |  |  | 1,781,400 |  |  | 9.42 |  | $ | 15.21 |  |  | 193,867 |  |  | 9.18 |  | $ | 15.14 |
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|  |  | 2,350,582 |  |  | 9.21 |  | $ | 11.88 |  |  | 397,486 |  |  | 8.84 |  | $ | 8.02 |
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|  | Options Outstanding at December 31, 2015 |  | Options Vested at December 31, 2015 |
Exercise Price |  | Number |  | Weighted Average Remaining Contractual Life (in Years) |  | Weighted Average Exercise Price |  | Number |  | Weighted Average Remaining Contractual Life (in Years) |  | Weighted Average Exercise Price |
$0.28 - $4.65 |  |  | 629,136 |  |  | 9.54 |  | $ | 1.28 |  |  | 9,637 |  |  | 9.06 |  | $ | 0.28 |
$6.75 - $15.79 |  |  | 155,000 |  |  | 10.00 |  | $ | 15.50 |  |  | — |  |  |  |  |  |  |
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|  |  | 784,136 |  |  | 9.63 |  | $ | 4.09 |  |  | 9,637 |  |  | 9.06 |  | $ | 0.28 |
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Schedule of options outstanding and exercisable that had vested or were expected to vest | Options outstanding and exercisable that had vested or were expected to vest at December 31, 2016 were as follows:
|  | Number of shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (years) |  | Aggregate Intrinsic Value (in thousands) |
Vested |  |  | 397,486 |  | $ | 8.02 |  |  | 8.84 |  | $ | 2,660 |
Expected to vest |  |  | 1,953,096 |  | $ | 12.66 |  |  | 9.27 |  | $ | 4,869 |

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