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Subsequent Event - Purchase Level and Number of Warrants to Vest (Details) - Common Stock Purchase Warrant - Supply Threshold - Subsequent event
Mar. 09, 2016
USD ($)
shares
Subsequent Event [Line Items]  
Supply threshold level one, amount | $ $ 260,000,000
Supply threshold level two, amount | $ 300,000,000
Supply threshold level three, amount | $ $ 340,000,000
Incremental warrants that will vest, vesting period one, supply threshold level one 100,000,000
Incremental warrants that will vest, vesting period one, supply threshold level two 75,000,000
Incremental warrants that will vest, vesting period one, supply threshold level three 75,000,000
Maximum potential warrants that will vest, vesting period one 250,000,000
Incremental warrants that will vest, vesting period two, supply threshold level one 100,000,000
Incremental warrants that will vest, vesting period two, supply threshold level two 75,000,000
Incremental warrants that will vest, vesting period two, supply threshold level three 75,000,000
Maximum potential warrants that will vest, vesting period two 250,000,000
Incremental warrants that will vest, vesting period three, supply threshold level one 75,000,000
Incremental warrants that will vest, vesting period three, supply threshold level two 75,000,000
Incremental warrants that will vest, vesting period three, supply threshold level three 75,000,000
Maxiumum potential warrants that will vest, vesting period three 225,000,000