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Performance-Based Common Stock Warrants - Narrative (Details) |  | 24 Months Ended
--- | --- | ---
Mar. 09, 2016 USD ($) vesting_period $ / shares shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2017 shares
Class of Warrant or Right [Line Items] |  |  |
Aggregate unrecognized estimated fair value of unvested warrants | $ |  | $ 3,900,000 |
Common Stock Purchase Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of shares called by warrants (in shares) | 725,000 |  |
Exercise price of warrants (in dollars per share) | $ / shares | $ 54.55 |  |
Number of vesting periods | vesting_period | 3 |  |
Term of successive vesting periods | 2 years |  |
Vesting period one | 2 years |  |
Number of vested warrants outstanding (in shares) |  | 275,000 |
Unearned underlying shares (in shares) |  | 225,000 |
Common Stock Purchase Warrants | Supply Threshold |  |  |
Class of Warrant or Right [Line Items] |  |  |
Aggregate level of purchases, $260 million threshold | $ | $ 260,000,000 |  |
Aggregate level of purchases, $340 million threshold | $ | 340,000,000 |  |
Supply threshold amount | $ | $ 340,000,000 |  |
Comcast | Common Stock Purchase Warrants |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of warrants vested in period (in shares) |  | 100,000 | 175,000
Maximum warrants available to vest (in shares) |  | 250,000 | 250,000

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