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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