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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2015
Stock-Based Compensation [Abstract] |
Compensation costs related to stock-based awards | The following table summarizes compensation costs related to our stock-based awards (in thousands, except per share data):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Cost of revenue |  | $ | 5 |  |  | $ | 5 |  |  | $ | 10 |  |  | $ | 10 |
Selling, general and administrative |  |  | 417 |  |  |  | 245 |  |  |  | 642 |  |  |  | 489 |
Research and development |  |  | 44 |  |  |  | 47 |  |  |  | 88 |  |  |  | 90 |
Total stock-based compensation |  |  | 466 |  |  |  | 297 |  |  |  | 740 |  |  |  | 589 |
Tax effect on stock-based compensation |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net effect on net income (loss) |  | $ | 466 |  |  | $ | 297 |  |  | $ | 740 |  |  | $ | 589 |
Weighted-average assumptions | The fair value of our stock options granted to employees for the three and six months ended June 30, 2015 was estimated using the following weighted-average assumptions:
|  | Three Months Ended June 30, 2015 |  |  | Six Months Ended June 30, 2015 |
Expected term (in years) |  |  | 1.0 |  |  |  | 1.0 |
Volatility |  |  | 54.21 | % |  |  | 54.21 | %
Expected dividend |  |  | 0 | % |  |  | 0 | %
Risk-free interest rate |  |  | 1.86 | % |  |  | 1.86 | %
Summary of stock option activity | The following table summarizes the stock option transactions during the six months ended June 30, 2015 (in thousands, except per share data):
Stock Options |  | Shares |  |  | Weighted- average Exercise Price |  |  | Weighted- average Remaining Contractual Life (in years) |  |  | Aggregate Intrinsic Value |
Balance as of January 1, 2015 |  |  | 3,198 |  |  | $ | 3.12 |  |  |  | 6.95 |  |  | $ | 1,247 |
Granted |  |  | 20 |  |  |  | 2.51 |  |  |  |  |  |  |  |  |
Exercised |  |  | (54 | ) |  |  | 1.40 |  |  |  |  |  |  |  |  |
Canceled and expired |  |  | (62 | ) |  |  | 3.86 |  |  |  |  |  |  |  |  |
Balance as of June 30, 2015 |  |  | 3,102 |  |  | $ | 3.13 |  |  |  | 5.54 |  |  | $ | 659 |
Options vested as of June 30, 2015 and unvested options expected to vest, net of forfeitures |  |  | 3,102 |  |  | $ | 3.13 |  |  |  | 5.54 |  |  | $ | 659 |
Options exercisable as of June 30, 2015 |  |  | 1,998 |  |  | $ | 3.44 |  |  |  | 4.38 |  |  | $ | 547 |
Restricted stock awards | A summary of activity related to restricted stock awards for the six months ended June 30, 2015 is presented below (in thousands, except per share data):
Stock Awards |  | Shares |  |  | Weighted-Average Grant Date Fair Value |
Non-vested as of January 1, 2015 |  |  | 261 |  |  | $ | 2.71 |
Granted |  |  | 336 |  |  | $ | 2.56 |
Vested |  |  | (118 | ) |  | $ | 2.65 |
Forfeited |  |  | (13 | ) |  | $ | 2.34 |
Non-vested as of June 30, 2015 |  |  | 466 |  |  | $ | 2.63 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 + Details
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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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