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Performance-Based Common Stock Warrants - Narrative (Details) - Common Stock Purchase Warrants |  | 6 Months Ended
--- | --- | ---
Mar. 09, 2016 USD ($) vesting_period $ / shares shares | Jun. 30, 2018 USD ($) shares
Class of Warrant or Right [Line Items] |  |
Number of shares called by warrants (in shares) | shares | 725,000 | 475,000
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
Total vesting period |  | 4 years
Number of warrants vested (in shares) | shares |  | 0
Unrecognized estimated fair value of unvested warrants |  | $ 2,900,000
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 |
Supply threshold amount |  | $ 680,000,000

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