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Subsequent Event - Additional Disclosures (Details) - Common Stock Purchase Warrant - Subsequent event
Mar. 09, 2016
USD ($)
vesting_period
$ / shares
shares
Subsequent Event [Line Items]  
Number of shares called by warrants | 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 (in years) 2 years
Vesting period one (in years) 2 years
Total vesting period (in years) 6 years
Supply Threshold  
Subsequent Event [Line Items]  
Supply threshold level one, amount $ 260,000,000
Supply threshold level three, amount 340,000,000
Supply threshold, amount $ 1,020,000,000