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Performance-Based Common Stock Warrants - Narrative (Details) - Common stock purchase warrants |  | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Mar. 09, 2016 USD ($) vesting_period $ / shares shares | Dec. 31, 2021 shares | Dec. 31, 2021 shares | Dec. 31, 2019 shares | Dec. 31, 2017 shares
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 | 2 years | 2 years | 2 years | 2 years
Vesting period one | 2 years |  |  |  |
Number of vested warrants outstanding (in shares) |  | 275,000 | 275,000 |  |
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 |  |  |  |
Comcast |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |
Number of warrants vested in period (in shares) |  |  | 0 | 100,000 | 175,000
Maximum warrants available to vest (in shares) |  |  | 225,000 | 250,000 | 250,000

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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