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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2017
Stock-Based Compensation |
Schedule of assumptions used in estimation of fair value of the share-based payment awards on the grant date |
| Nine Months Ended |
| September 30, |
| 2017 |  | 2016 |
Risk-free interest rate | 1.6% |  | 1.0% - 1.2% |
Volatility | 70.2% |  | 61.4% - 63.8% |
Expected life (years) | 4.0 |  | 4.0 - 5.0 |
Dividend yield | 0% |  | 0% |
Summary of option and RSU activity under Amended and Restated 2000 Stock Option and Equity Incentive Plan and Amended and Restated 2010 Equity Incentive Plan | A summary of the option and RSU activity under the Company’s Amended and Restated 2010 Equity Incentive Plan (the Plan) is presented below (in thousands, except exercise price):
|  |  |  | Options outstanding |
|  |  |  |  |  | Weighted |
|  | Shares |  |  |  | Average |
|  | Available |  | Number of |  | Exercise |
|  | for Grant |  | Shares |  | Prices |
Balance at January 1, 2017 |  | 114 |  | 522 |  | $ | 13.88 |
Additional shares authorized under the Plan |  | 50 |  | — |  |  | — |
RSUs cancelled and returned to the Plan |  | 5 |  | — |  |  | — |
Options granted |  | (1) |  | 1 |  | $ | 2.36 |
Options cancelled and returned to the Plan |  | 15 |  | (15) |  | $ | 6.94 |
Balance at March 31, 2017 |  | 183 |  | 508 |  | $ | 14.06 |
RSUs cancelled and returned to Plan |  | 37 |  | — |  |  | — |
Options cancelled and returned to Plan |  | 172 |  | (172) |  | $ | 10.20 |
Balance at June 30, 2017 |  | 392 |  | 336 |  | $ | 16.04 |
RSUs granted |  | (407) |  | — |  |  | — |
RSUs cancelled and returned to Plan |  | 8 |  | — |  |  | — |
Options cancelled and returned to Plan |  | 88 |  | (88) |  | $ | 14.83 |
Balance at September 30, 2017 |  | 81 |  | 248 |  | $ | 16.47 |
Summary of RSU activity under the Plans | A summary of RSU activity under the Plan is presented below (in thousands, except for fair value):
|  |  |  | Weighted |
|  |  |  | Average |
|  | Number of |  | Grant-Date |
|  | Shares |  | Fair Value |
Non-vested shares at January 1, 2017 |  | 148 |  | $ | 8.13 |
Vested |  | (54) |  | $ | 11.64 |
Cancelled |  | (5) |  | $ | 5.30 |
Non-vested shares at March 31, 2017 |  | 89 |  | $ | 6.16 |
Cancelled |  | (37) |  | $ | 5.75 |
Non-vested shares at June 30, 2017 |  | 52 |  | $ | 6.46 |
Granted |  | 407 |  | $ | 0.93 |
Vested |  | (66) |  | $ | 0.95 |
Cancelled |  | (8) |  | $ | 5.30 |
Non-vested shares at September 30, 2017 |  | 385 |  | $ | 1.58 |
Summary of significant ranges of outstanding and exercisable options | The following table summarizes significant ranges of outstanding and exercisable options as of September 30, 2017 (in thousands, except contractual life and exercise price):
|  | Options Outstanding |  | Options Exercisable |  |  |  |
|  |  |  | Weighted |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  | Average |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  | Remaining |  | Weighted |  |  |  | Weighted |  |  |  |
|  |  |  | Contractual |  | Average |  |  |  | Average |  | Aggregate |
|  | Number |  | Life |  | Exercise |  | Number |  | Exercise |  | Intrinsic |
Range of Exercise Price |  | Outstanding |  | (in Years) |  | Price |  | Exercisable |  | Price |  | value |
$2.36 - $7.19 |  | 19 |  | 6.44 |  | $ | 5.07 |  | 12 |  | $ | 5.30 |  |  |  |
$7.20 - $16.99 |  | 122 |  | 8.35 |  | $ | 7.20 |  | 49 |  | $ | 7.20 |  |  |  |
$17.00 - $20.49 |  | 4 |  | 3.79 |  | $ | 17.00 |  | 4 |  | $ | 17.00 |  |  |  |
$20.50 - $30.89 |  | 45 |  | 7.42 |  | $ | 20.50 |  | 39 |  | $ | 20.50 |  |  |  |
$30.90 - $41.89 |  | 41 |  | 0.61 |  | $ | 36.44 |  | 41 |  | $ | 33.41 |  |  |  |
$41.90 - $46.20 |  | 17 |  | 4.16 |  | $ | 44.01 |  | 17 |  | $ | 44.01 |  |  |  |
$2.36 - $46.20 |  | 248 |  | 6.40 |  | $ | 16.47 |  | 162 |  | $ | 21.34 |  | $ | — |
Vested and expected to vest |  | 240 |  | 6.32 |  | $ | 16.77 |  |  |  |  |  |  | $ | — |
Exercisable |  | 162 |  | 5.11 |  | $ | 21.34 |  |  |  |  |  |  | $ | — |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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