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Performance-Based Common Stock Warrants - Narrative (Details) |  | 9 Months Ended
--- | --- | ---
Mar. 09, 2016 USD ($) vesting_period $ / shares shares | Sep. 30, 2019 USD ($) shares
Class of Warrant or Right [Line Items] |  |
Unrecognized estimated fair value of unvested warrants | $ |  | $ 6,400,000
Common Stock Purchase Warrants |  |
Class of Warrant or Right [Line Items] |  |
Number of shares called by warrants (in shares) | 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
Vesting period one | 2 years |
Vested warrants outstanding (in shares) | shares |  | 175,000
Unearned underlying shares (in shares) | shares |  | 475,000
Number of warrants vested (in shares) | shares |  | 0
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 | $ |  | $ 680,000,000

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