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Performance-Based Common Stock Warrants - Purchase Level and Number of Warrants to Vest (Details) - Supply Threshold [Member] - Common Stock Purchase Warrant [Member]
Mar. 09, 2016
USD ($)
shares
Class of Warrant or Right [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
Maximum potential warrants that will vest, vesting period three 225,000,000