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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2015
Stockholders' Equity Note [Abstract] |
Summary of warrant activity | A summary of warrant activity for the nine months ended September 30, 2015 is presented as follows:
| Warrants Outstanding |  | Weighted Average Exercise Price During Period
Balance at December 31, 2014 | 969,549 |  |  | $ | 4.61 |
Exercised | (638,189 | ) |  | 4.58 |
Canceled/forfeited | (112,110 | ) |  | 5.54 |
Expired | (205,000 | ) |  | 4.20 |
Balance at September 30, 2015 | 14,250 |  |  | $ | 4.30 |
Exercisable at September 30, 2015 | — |  |  | $ | — |
Summary of stock-based compensation expense | The following table summarizes stock-based compensation expense and the impact it had on operations for the periods presented (in thousands):
| Three months ended September 30, |  | Nine months ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Cost of sales | $ | 11 |  |  | $ | 4 |  |  | $ | 29 |  |  | $ | 8 |
Product development | 10 |  |  | 3 |  |  | 26 |  |  | 5 |
Selling, general, and administrative | 294 |  |  | 140 |  |  | 544 |  |  | 380 |
Total stock-based compensation | $ | 315 |  |  | $ | 147 |  |  | $ | 599 |  |  | $ | 393 |
Schedule of valuation assumptions | Estimates utilized in the calculation include the expected life of the option, risk-free interest rate, and expected volatility, and are further comparatively detailed as follows:
| Nine months ended September 30,
| 2015 |  | 2014
Fair value of options issued | $ | 5.18 |  |  | $ | 3.44 |
Exercise price | $ | 7.04 |  |  | $ | 4.48 |
Expected life of option (in years) | 5.8 |  |  | 5.6 |
Risk-free interest rate | 1.7 | % |  | 1.8 | %
Expected volatility | 90.7 | % |  | 97.9 | %
Dividend yield | 0.0 | % |  | 0.0 | %
Summary of option activity | A summary of option activity under all plans for the nine months ended September 30, 2015 is presented as follows:
| Number of Option |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Life (in years)
Balance at December 31, 2014 | 459,271 |  |  | $ | 8.95 |  |  |
Granted | 326,000 |  |  | 8.35 |  |  |
Exercised | (45,361 | ) |  | 4.63 |  |  |
Canceled/forfeited | (105,565 | ) |  | 6.26 |  |  |
Expired | (5,900 | ) |  | 96.00 |  |  |
Balance at September 30, 2015 | 628,445 |  |  | $ | 8.58 |  |  | 8.4
Vested and expected to vest at September 30, 2015 | 575,974 |  |  | $ | 8.71 |  |  | 8.3
Exercisable at September 30, 2015 | 282,583 |  |  | $ | 9.18 |  |  | 7.2
Restricted stock units A summary of restricted stock unit activity under all plans for the nine months ended September 30, 2015 is presented as follows:
| Restricted Stock Units |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Life (in years)
Balance at December 31, 2014 | — |  |  | $ | — |  |  |
Granted | 72,750 |  |  | 6.82 |  |  |
Canceled/forfeited | (14,250 | ) |  | 5.55 |  |  |
Balance at September 30, 2015 | 58,500 |  |  | $ | 7.13 |  |  | 1.1

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + 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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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 + Details
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