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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Stockholders' Equity Note [Abstract] |
Schedule of Warrants |
| Warrants Outstanding |  | Weighted Average Exercise Price During Period
Balance, December 31, 2014 | 969,549 |  |  | 4.61 |
Warrants exercised | (638,189 | ) |  | 4.58 |
Warrants cancelled/forfeited | (112,110 | ) |  | 5.54 |
Warrants expired | (205,000 | ) |  | 4.20 |
Balance, December 31, 2015 | 14,250 |  |  | 4.30 |
Warrants cancelled/forfeited | (7,500 | ) |  | 4.30 |
Balance, December 31, 2016 | 6,750 |  |  | $ | 4.30 |
Warrants cancelled/forfeited | (6,750 | ) |  | $ | 4.30 |
Balance, December 31, 2017 | — |  |  | $ | — |
Summary of Impact of Results of Stock-Based Compensation | The impact on our results for stock-based compensation was as follows (in thousands):
| For the year ended December 31,
| 2017 |  | 2016 |  | 2015
Cost of sales | $ | 34 |  |  | $ | 56 |  |  | $ | 38 |
Product development | 59 |  |  | 84 |  |  | 37 |
Selling, general, and administrative | 714 |  |  | 1,220 |  |  | 738 |
Total stock-based compensation | $ | 807 |  |  | $ | 1,360 |  |  | $ | 813 |
Schedule of Share-Based Payment Award, Stock Options, 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:
| 2017 |  | 2016 |  | 2015
Fair value of options issued | $ | 2.66 |  |  | $ | 5.27 |  |  | $ | 5.33 |
Exercise price | $ | 3.55 |  |  | $ | 7.46 |  |  | $ | 7.23 |
Expected life of option (in years) | 5.8 |  |  | 5.8 |  |  | 5.8 |
Risk-free interest rate | 2.1 | % |  | 1.5 | % |  | 1.7 | %
Expected volatility | 91.9 | % |  | 93.7 | % |  | 90.7 | %
Dividend yield | 0.00 | % |  | 0.00 | % |  | 0.00 | %
Summary of Option Activity | A summary of option activity under all plans was as follows:
| Number of Options |  | Weighted Average Exercise Price Per Share
Outstanding at December 31, 2014 | 459,271 |  |  | $ | 8.95 |
Granted | 340,500 |  |  | 8.65 |
Cancelled | (147,152 | ) |  | 10.10 |
Exercised | (50,412 | ) |  | 4.69 |
Outstanding at December 31, 2015 | 602,207 |  |  | 8.58 |
Granted | 167,819 |  |  | 7.31 |
Cancelled | (160,126 | ) |  | 12.94 |
Exercised | (79,166 | ) |  | 4.48 |
Outstanding at December 31, 2016 | 530,734 |  |  | 7.48 |
Granted | 192,984 |  |  | 3.55 |
Cancelled | (377,095 | ) |  | 6.71 |
Expired | (56,111 | ) |  | 10.65 |
Exercised | (42,000 | ) |  | 2.30 |
Outstanding at December 31, 2017 | 248,512 |  |  | $ | 5.76 |
Vested and expected to vest at December 31, 2017 | 228,880 |  |  | $ | 5.97 |
Exercisable at December 31, 2017 | 110,476 |  |  | $ | 8.63 |
Schedule of Options Outstanding | The options outstanding at December 31, 2017 have been segregated into ranges for additional disclosure as follows:
OPTIONS OUTSTANDING |  | OPTIONS EXERCISABLE
Range of Exercise Prices |  | Number of Shares Outstanding |  | Weighted Average Remaining Contractual Life (in years) |  | Weighted Average Exercise Price |  | Number of Shares Exercisable |  | Weighted Average Remaining Contractual Life (in years) |  | Weighted Average Exercise Price
$2.30 | — | $3.25 |  | 59,558 |  |  | 9.1 |  | $ | 3.04 |  |  | 2,000 |  |  | 4.9 |  | $ | 2.45 |
$3.26 | — | $4.00 |  | 74,165 |  |  | 9.2 |  | 3.43 |  |  | — |  |  | 9.2 |  | 3.43 |
$4.01 | — | $5.50 |  | 51,919 |  |  | 6.6 |  | 4.96 |  |  | 50,461 |  |  | 6.6 |  | 4.94 |
$5.51 | — | $20.00 |  | 62,870 |  |  | 6.0 |  | 11.75 |  |  | 58,015 |  |  | 5.8 |  | 12.05 |
|  |  |  | 248,512 |  |  | 7.8 |  | $ | 5.76 |  |  | 110,476 |  |  | 6.1 |  | $ | 8.63 |
Summary of Restricted Stock Activity | The following table shows a summary of restricted stock and restricted stock unit activity:
| Restricted Stock Units Outstanding |  | Weighted Average Grant Date Fair Value
At December 31, 2014 | — |  |  | — |
Granted | 73,750 |  |  | 6.92 |
Forfeited | (16,250 | ) |  | 5.54 |
At December 31, 2015 | 57,500 |  |  | $ | 7.31 |
Granted | 290,966 |  |  | 6.56 |
Vested | (11,213 | ) |  | 14.18 |
Forfeited | (87,138 | ) |  | 6.73 |
At December 31, 2016 | 250,115 |  |  | $ | 6.34 |
Granted | 375,542 |  |  | $ | 3.18 |
Vested | (115,622 | ) |  | $ | 5.78 |
Forfeited | (203,893 | ) |  | $ | 5.30 |
At December 31, 2017 | 306,142 |  |  | $ | 3.37 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&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 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: 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=96867065&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=96867065&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=96867065&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=68057994&loc=d3e25284-112666 + Details
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