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Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 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 |  | Six Months Ended |
|  | June 30, |  | June 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
Cost of revenue |  | $ | 21 |  | $ | 7 |  | $ | 42 |  | $ | 15 |
Selling, general and administrative |  |  | 368 |  |  | 252 |  |  | 737 |  |  | 508 |
Research and development |  |  | 75 |  |  | 51 |  |  | 152 |  |  | 99 |
Total stock-based compensation |  |  | 464 |  |  | 310 |  |  | 931 |  |  | 622 |
Tax effect on stock-based compensation |  |  | — |  |  | — |  |  | — |  |  | — |
Net effect on net income |  | $ | 464 |  | $ | 310 |  | $ | 931 |  | $ | 622 |
Summary of weighted-average assumptions |
|  | Six Months Ended |  | Six Months Ended |  |
|  | June 30, |  | June 30, |  |
|  | 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 June 30, 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 |  | (66) |  |  | 2.68 |  |  |  |  |  |
Canceled and expired |  | (2) |  |  | 5.21 |  |  |  |  |  |
Balance as of June 30, 2018 |  | 2,598 |  | $ | 3.83 |  | 6.44 |  | $ | 8,715 |
Options vested as of June 30, 2018 and unvested options expected to vest, net of forfeitures |  | 2,576 |  | $ | 3.81 |  | 6.42 |  | $ | 8,678 |
Options exercisable as of June 30, 2018 |  | 1,771 |  | $ | 3.42 |  | 5.71 |  | $ | 6,452 |
Summary of restricted stock awards activity | A summary of activity related to restricted stock awards for the six months ended June 30, 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 |  | 35 |  | $ | 7.49 |
Vested |  | (49) |  | $ | 6.19 |
Forfeited |  | (3) |  | $ | 9.50 |
Non-vested as of June 30, 2018 |  | 463 |  | $ | 7.24 |

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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=96867065&loc=d3e5070-113901 + Details
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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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