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Stockholders' Equity and Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Stock-Based Compensation Resulting from Employee Incentive Share Arrangements | The following table presents stock-based compensation expense resulting from employee incentive stock arrangements and is presented in the following line items in the accompanying consolidated statements of income for the years ended December 31, 2015, 2014 and 2013 (in thousands):
Years Ended December 31, |  | 2015 |  |  | 2014 |  |  | 2013 |
Operating expense |  | $ | 235 |  |  | $ | 32 |  |  | $ | 222 |
Sales and marketing |  |  | 559 |  |  | 166 |  |  | 114 |
Research and development |  |  | 104 |  |  | 16 |  |  | 345 |
General and administrative |  |  | 2,112 |  |  | 498 |  |  | 253 |
Total stock-based compensation expense |  | $ | 3,010 |  |  | $ | 712 |  |  | $ | 934 |
Nonvested Restricted Stock Unit Awards | The following table presents a summary of the activity related to restricted stock for the year ended December 31, 2015:
Year ended December 31, 2015 |  |  |  | Number of shares |  |  | Weighted average grant- date fair value (in dollars) |
Restricted stock outstanding at January 1, 2015 |  |  |  |  | 4,540,020 |  |  | $ | 0.24 |
2015 Restricted Stock granted |  |  |  |  | 741,931 |  |  |  | 27.65 |
2014 Restricted Stock vested |  |  |  |  | (3,287,091 | ) |  |  | 0.20 |
2014 Restricted Stock forfeited |  |  |  |  | (7,215 | ) |  |  | 0.48 |
2015 Restricted Stock forfeited |  |  |  |  | (7,805 | ) |  |  | 30.95 |
Restricted stock outstanding at December 31, 2015 |  |  |  |  | 1,979,840 |  |  |  | 10.45 |
Incentive Units [Member] |
Summary of Grant-Date Fair Values and Related Assumptions | The following table presents a summary of the pre-conversion grant-date fair values of incentive units granted during 2013 and the related assumptions:
|  | Year Ended December 31, 2013 |
Grant-date fair value |  |  |  |
Incentive units (converted to restricted stock as of January 1, 2014) |  | $0.11 - $0.92 |
Risk-free interest rates (based on 5 year U.S. Treasury Securities) |  | 0.71% - 1.41% |
Estimated volatility |  |  | 50.0% |
Expected life (in years) |  |  | 5.0 |
Dividend yield |  | 0% |
2015 Restricted Stock [Member] |
Summary of Grant-Date Fair Values and Related Assumptions | The following table presents a summary of the grant-date fair values of 2015 Restricted Stock granted during the year ended December 31, 2015 and the related assumptions:
Years Ended December 31, |  | 2015 |
Grant-date fair value |  |  |  |
Restricted stock |  | $21.76 - $33.33 |
Risk-free interest rate (based on 10 year U.S. Treasury Securities) |  |  | 2% |
Estimated volatility |  |  | 26.0% |
Expected life (in years) |  |  | 3.6 |
Dividend yield |  | 0% |

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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 changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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