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Debt - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018 | Dec. 31, 2016 | Sep. 02, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fair value of warrant | $ 11,466,162 | $ 11,466,162 |  |  | $ 11,466,162 |  | $ 6,727,409 |
London Interbank Offered Rate (LIBOR) | Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Margin for term loan |  |  |  |  | 11.50% |  |  |
Debt instrument, interest rate during period |  |  |  |  | 18.80% |  |  |
Warrants |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fair value of warrant | 11,500,000 | 11,500,000 |  |  | $ 11,500,000 |  |  | $ 5,800,000
Secured Debt | Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility | 80,000,000 | 80,000,000 |  |  | 80,000,000 |  |  | 80,000,000
Interest expense, debt |  |  |  |  | 14,800,000 |  |  |
Interest paid on term loan |  |  |  |  | 10,300,000 |  |  |
Amortization of debt issuance costs | 4,500,000 |  |  |  |  |  |  |
Debt instrument, fee amount | 4,000,000 | 4,000,000 |  |  | $ 4,000,000 |  |  |
Line of credit facility, minimum cash requirement |  | 10,000,000 |  |  |  |  |  |
Potential increase in interest rate |  |  |  |  | 2.00% |  |  |
Debt issuance costs, gross |  |  |  |  |  |  |  | $ 8,200,000
Remaining borrowing capacity | 71,100,000 | 71,100,000 |  |  | $ 71,100,000 |  |  |
Secured Debt | US Treasury Rate | Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Margin for term loan |  |  |  |  | 0.50% |  |  |
Secured Debt | Repayment of Interests | Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Capacity available for specific purpose other than for trade purchases | 25,000,000 | 25,000,000 |  |  | $ 25,000,000 |  |  |
Secured Debt | Payments Related to Litigation | Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Capacity available for specific purpose other than for trade purchases | $ 50,000,000 | $ 50,000,000 |  |  | $ 50,000,000 |  |  |
Secured Debt | Scenario, Forecast | Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Additional borrowing capacity |  |  |  |  |  | $ 5,000,000 |  |
Line of credit facility, minimum cash requirement |  |  | $ 20,000,000 | $ 5,000,000 |  |  |  |

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(8)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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