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Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2018
Stock-based Compensation |
Summary of 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
|  | March 31,
|  | 2018 |  | 2017
Cost of revenue |  | $ | 21 |  | $ | 8
Selling, general and administrative |  |  | 369 |  |  | 256
Research and development |  |  | 77 |  |  | 48
Total stock-based compensation |  |  | 467 |  |  | 312
Tax effect on stock-based compensation |  |  | — |  |  | —
Net effect on net income |  | $ | 467 |  | $ | 312
Summary of weighted-average assumptions |
|  | Three Months Ended |  | Three Months Ended |
|  | March 31, |  | March 31, |
|  | 2018 |  | 2017 |
Expected term (in years) |  | — |  | 5.9 |
Volatility |  | — | % | 46.71 | %
Expected dividend |  | — | % | — | %
Risk-free interest rate |  | — | % | 2.08 | %
Summary of stock option activity | The following table summarizes the stock option transactions during the three months ended March 31, 2018 (in thousands, except per share data):
|  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  |  |  |  | average |  |  |  |
|  |  |  | Weighted- |  | Remaining |  |  |  |
|  | Number of |  | average |  | Contractual |  | Aggregate |
|  | Options |  | Exercise |  | Life |  | Intrinsic |
Stock Options |  | Outstanding |  | Price |  | (in years) |  | Value |
Balance as of January 1, 2018 |  | 2,666 |  | $ | 3.81 |  | 6.87 |  | $ | 13,149 |
Granted |  | — |  |  | — |  |  |  |  |  |
Exercised |  | (22) |  |  | 2.94 |  |  |  | $ | 97 |
Canceled and expired |  | — |  |  | — |  |  |  |  |  |
Balance as of March 31, 2018 |  | 2,644 |  | $ | 3.81 |  | 6.66 |  | $ | 9,409 |
Options vested as of March 31, 2018 and unvested options expected to vest, net of forfeitures |  | 2,616 |  | $ | 3.79 |  | 6.64 |  | $ | 9,352 |
Options exercisable as of March 31, 2018 |  | 1,694 |  | $ | 3.41 |  | 5.81 |  | $ | 6,523 |
Summary of restricted stock awards activity | A summary of activity related to restricted stock awards for the three months ended March 31, 2018 is presented below (in thousands, except per share data):
|  |  |  | Weighted-Average |
|  |  |  | Grant Date |
Stock Awards |  | Shares |  | Fair Value |
Non-vested as of January 1, 2018 |  | 480 |  | $ | 7.13 |
Granted |  | 4 |  | $ | 7.35 |
Vested |  | — |  | $ | — |
Forfeited |  | — |  | $ | — |
Non-vested as of March 31, 2018 |  | 484 |  | $ | 7.13 |

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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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