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Performance-Based Common Stock Warrants - Additional Disclosures (Details) - Common stock purchase warrant | Mar. 09, 2016 USD ($) vesting_period $ / shares shares | Sep. 30, 2017 USD ($) shares
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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 voting periods (in years) | 2 years |
Vesting period one (in years) | 2 years |
Total vesting period (in years) | 6 years |
Warrants vested (in shares) | shares |  | 100,000
Unrecognized fair value of unvested warrants |  | $ 14,200,000
Supply threshold |  |
Class of Warrant or Right [Line Items] |  |
Supply threshold level one, amount | $ 260,000,000 |
Supply threshold level three, amount | 340,000,000 |
Supply threshold, amount | $ 1,020,000,000.00 |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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