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Performance-Based Common Stock Warrants | 3 Months Ended
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Mar. 31, 2016
Equity [Abstract] |
Performance-Based Common Stock Warrants | Performance-Based Common Stock Warrants On March 9, 2016, we issued common stock purchase warrants to Comcast Corporation ("Comcast") to purchase up to 725,000 shares of our common stock at a price of $54.55 per share. The right to exercise the warrants under this agreement is subject to vesting over three successive two-year periods (with the first two-year period commencing on January 1, 2016) based on the level of purchases of goods and services from us by Comcast and its affiliates, as defined in the warrant agreement. The table below presents the purchase levels and number of warrants that will vest in each period based upon achieving these purchase levels.
| Incremental Warrants That Will Vest
Aggregate Level of Purchases by Comcast and Affiliates | January 1, 2016 - December 31, 2017 |  | January 1, 2018 - December 31, 2019 |  | January 1, 2020 - December 31, 2021
$260 million | 100,000 |  |  | 100,000 |  |  | 75,000 |
$300 million | 75,000 |  |  | 75,000 |  |  | 75,000 |
$340 million | 75,000 |  |  | 75,000 |  |  | 75,000 |
Maximum Potential Warrants Earned by Comcast | 250,000 |  |  | 250,000 |  |  | 225,000 |
If total aggregate purchases by Comcast and its affiliates are below $260 million in any of the two-year periods above, no warrants will vest related to that two-year period. If total aggregate purchases of goods and services by Comcast and its affiliates exceed $340 million during either the first or second two-year period, the amount of any such excess will count toward aggregate purchases in the following two-year period. To fully vest in the rights to purchase all of the underlying shares, Comcast and its affiliates must purchase an aggregate of $1.02 billion in goods and services from us during the six-year vesting period. Any and all warrants that vest will expire on January 1, 2023. The warrants provide for certain adjustments that may be made to the exercise price and the number of shares issuable upon exercise due to customary anti-dilution provisions. Additionally, in connection with the common stock purchase warrants, we have also entered into a registration rights agreement with Comcast under which Comcast may from time to time request that we register the shares of common stock underlying vested warrants with the SEC. Because the warrants contain performance criteria under which Comcast must achieve specified aggregate purchase levels for the warrants to vest, as detailed above, the measurement date for the warrants is the date on which the warrants vest. The estimated fair value of warrants is being recorded as a reduction to net sales ratably as the warrants vest based on the projected number of warrants that will vest, the proportion of purchases by Comcast and its affiliates within the period relative to the aggregate purchase levels required for the warrants to vest and the then-current fair value of the related unvested warrants. To the extent that our projections change in the future as to the number of warrants that will vest, a cumulative catch-up adjustment will be recorded in the period in which our estimates change. At March 31, 2016, none of the warrants had vested. The fair value of the warrants is determined using the Black-Scholes option pricing model. The assumptions we utilized and the resulting fair value of the warrants were the following:
| Three Months Ended March 31, 2016
Fair value | $29.86
Risk-free interest rate | 1.50%
Expected volatility | 41.49%
Expected life in years | 6.75
For the three months ended March 31, 2016, we recorded $0.9 million as a reduction to net sales in connection with the common stock warrants, and the aggregate unrecognized estimated fair value of unvested warrants at March 31, 2016 was $20.8 million.

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