Debt - Narrative (Details)
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1 Months Ended |
3 Months Ended |
12 Months Ended |
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Dec. 15, 2017
USD ($)
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Oct. 31, 2017
USD ($)
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Aug. 24, 2017
shares
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Aug. 31, 2018
USD ($)
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Dec. 31, 2017
USD ($)
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Dec. 31, 2018
USD ($)
payment
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Dec. 31, 2017
USD ($)
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Jun. 15, 2018
USD ($)
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Feb. 28, 2018
USD ($)
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Jan. 31, 2018
USD ($)
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Sep. 30, 2017
USD ($)
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Aug. 31, 2017
USD ($)
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Jan. 31, 2017
USD ($)
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Jul. 31, 2016
USD ($)
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Jan. 31, 2016
USD ($)
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Aug. 31, 2015
USD ($)
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| Debt Instrument [Line Items] |
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| Value of shares granted to purchase |
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$ 2,000,000
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| Shares offered to resell ratio |
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0.5
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| Line of Credit | Madryn Credit Agreement |
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| Debt Instrument [Line Items] |
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| Interest expense |
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$ 5,400,000
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$ 1,400,000
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| Fair value of options |
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$ 15,100,000
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| Principal balance outstanding |
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$ 40,000,000
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40,000,000
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| Maximum borrowing capacity |
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55,000,000.0
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| Borrowings on credit facility |
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10,000,000
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| Weighted average interest rate |
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13.44%
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| Number of payments | payment |
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8
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| Quarterly principal payments percentage |
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12.50%
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| Debt discount |
$ 5,000,000
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$ 5,000,000
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| Legal expenses |
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$ 1,300,000
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| Maximum investment in subsidiary |
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$ 5,000,000.0
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$ 5,000,000.0
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| Line of Credit | Madryn Credit Agreement | London Interbank Offered Rate (LIBOR) |
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| Debt Instrument [Line Items] |
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| Credit agreement interest rate |
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11.00%
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| Default interest rate |
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4.00%
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| Line of Credit | Madryn Credit Agreement - Term A |
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| Debt Instrument [Line Items] |
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| Capacity available for trade purchases |
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$ 30,000,000
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| Line of Credit | Madryn Credit Agreement - Term B and C |
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| Debt Instrument [Line Items] |
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| Borrowing capacity available upon achieving revenue milestones |
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25,000,000
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| Line of Credit | Madryn Credit Agreement - Term B-1 |
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| Debt Instrument [Line Items] |
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| Borrowings on credit facility |
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$ 5,000,000
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| Line of Credit | Madryn Credit Agreement - Term B-2 |
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| Debt Instrument [Line Items] |
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| Borrowings on credit facility |
$ 5,000,000
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| Line of Credit | Madryn Credit Agreement - Term B-3 |
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| Debt Instrument [Line Items] |
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| Capacity available for trade purchases |
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$ 5,000,000.0
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| Line of Credit | Madyrn Credit Agreement - Term C |
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| Debt Instrument [Line Items] |
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| Capacity available for trade purchases |
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$ 10,000,000
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| Affiliated Entity | Notes Payable |
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| Debt Instrument [Line Items] |
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| Principal balance |
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$ 1,200,000
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| Affiliated Entity | Notes Payable | Seven Percent Notes Payable |
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| Debt Instrument [Line Items] |
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| Principal balance |
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$ 4,200,000
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| Simple rate |
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7.00%
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| Interest expense |
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200,000
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200,000
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| Repayment of debt |
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$ 5,100,000
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| Accrued interest subject to compromise |
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$ 900,000
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| Principal balance outstanding |
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4,218,000
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$ 0
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4,218,000
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$ 4,300,000
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| Affiliated Entity | Convertible Debt | Related Party Convertible Notes Payable |
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| Debt Instrument [Line Items] |
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| Simple rate |
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10.00%
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| Maximum borrowing capacity |
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$ 19,800,000.0
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$ 18,000,000.0
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15,000,000.0
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| Amortization of debt discount |
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1,100,000
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| Fair value of options |
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$ 100,000
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| Conversion of related party convertible notes payable into ordinary shares | shares |
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5,869,417
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| Principal balance outstanding |
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$ 0
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$ 0
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$ 0
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