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Stock Options (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Weighted Average Assumptions Used in Estimating Fair Value of Stock Options |
|  | December 31, 2016 |  |  | December 31, 2015 |  |  | December 31, 2014 |
Valuation assumptions: |  |  |  |  |  |  |  |  |  |  |  |
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected volatility |  |  | 41.82 | % |  |  | 56.74 | % |  |  | 64.40 | %
Expected term (years) |  |  | 6.07 |  |  |  | 5.42 |  |  |  | 5.74 |
Risk-free interest rate |  |  | 1.6 | % |  |  | 1.7 | % |  |  | 1.9 | %
Summary of Outstanding Stock Option Activity | Stock option activity during the periods indicated is as follows:
|  | Number of shares |  |  | Weighted average exercise price |  |  | Weighted average remaining contractual term |
Balance at December 31, 2013 |  |  | 364,450 |  |  | $ | 2.73 |  |  |  | 4.3 |
Granted |  |  | 255,600 |  |  |  | 2.70 |  |  |  | 9.2 |
Exercised |  |  | (100 | ) |  |  | 2.20 |  |  | - |
Expired/Forfeited |  |  | (115,400 | ) |  |  | 3.22 |  |  | - |
Balance at December 31, 2014 |  |  | 504,550 |  |  | $ | 2.60 |  |  |  | 5.8 |
Granted |  |  | 512,402 |  |  |  | 2.00 |  |  |  | 9.2 |
Exercised |  |  | (24,260 | ) |  |  | 3.19 |  |  |  | — |
Expired/Forfeited |  |  | (236,000 | ) |  |  | 2.77 |  |  |  | — |
Balance at December 31, 2015 |  |  | 756,692 |  |  | $ | 2.10 |  |  |  | 7.6 |
Granted |  |  | 359,319 |  |  |  | 2.60 |  |  |  | 9.4 |
Exercised |  |  | (58,155 | ) |  |  | 2.36 |  |  |  | 3.5 |
Expired/Forfeited |  |  | (17,469 | ) |  |  | 2.13 |  |  |  | 2.6 |
Balance at December 31, 2016 |  |  | 1,040,387 |  |  | $ | 2.25 |  |  |  | 7.8 |
Vested and exercisable at December 31, 2016 |  |  | 628,933 |  |  | $ | 2.05 |  |  |  | 7.0 |
Vested and expected to vest at December 31, 2016 |  |  | 1,012,596 |  |  | $ | 2.24 |  |  |  | 7.8 |

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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 employee stock purchase plans, including, but not limited to: (a) expected term, (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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