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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2016
Schedule of stock-based compensation expense | Included in the accompanying condensed consolidated statements of operations are the following amounts of stock-based compensation for the three months ended March 31, 2016 and 2015 (amounts in thousands):
|  | Three months |
|  | ended |
|  | March 31, |
|  | 2016 |  | 2015 |
Operating expense |  | $ | 2 |  | — |
Selling, general and administrative |  |  | 1,546 |  | 1,331 |
Research and development |  |  | 74 |  | 24 |
|  | $ | 1,622 |  | 1,355 |
Class A common stock |
Schedule of stock awards activity |
|  |  |  |  |  |  | Weighted |  |  |
|  |  |  |  |  |  | average |  |  |
|  |  |  |  |  |  | remaining |  | Aggregate
|  |  |  |  |  |  | contractual |  | intrinsic
|  | Series A |  | WAEP |  | life |  | value
|  | (in thousands) |  |  |  |  | (in years) |  | (in millions)
Outstanding at January 1, 2016 |  | 630 |  | $ | 32.36 |  |  |  |  |
Granted |  | — |  | $ | — |  |  |  |  |
Exercised |  | (58) |  | $ | 31.63 |  |  |  |  |
Forfeited/Cancelled |  | — |  | $ | — |  |  |  |  |
Outstanding at March 31, 2016 |  | 572 |  | $ | 32.43 |  | 2.9 |  | $ | 15
Exercisable at March 31, 2016 |  | 551 |  | $ | 32.28 |  | 2.8 |  | $ | 14
Class C common stock |
Schedule of stock awards activity |
|  |  |  |  |  |  | Weighted |  |  |
|  |  |  |  |  |  | average |  |  |
|  |  |  |  |  |  | remaining |  | Aggregate
|  |  |  |  |  |  | contractual |  | intrinsic
|  | Series C |  | WAEP |  | life |  | value
|  | (in thousands) |  |  |  |  | (in years) |  | (in millions)
Outstanding at January 1, 2016 |  | 2,761 |  | $ | 41.09 |  |  |  |  |
Granted |  | — |  | $ | — |  |  |  |  |
Exercised |  | (149) |  | $ | 31.97 |  |  |  |  |
Forfeited/cancelled |  | — |  | $ | — |  |  |  |  |
Outstanding at March 31, 2016 |  | 2,612 |  | $ | 41.61 |  | 6.3 |  | $ | 43
Exercisable at March 31, 2016 |  | 1,040 |  | $ | 32.22 |  | 2.8 |  | $ | 27

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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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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