Debt - Narrative (Details) - Line of Credit - USD ($)
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1 Months Ended |
3 Months Ended |
6 Months Ended |
9 Months Ended |
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Aug. 12, 2019 |
Jun. 17, 2019 |
Dec. 15, 2017 |
Oct. 31, 2017 |
Aug. 31, 2019 |
Jun. 30, 2019 |
Dec. 31, 2017 |
Jun. 16, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
Dec. 31, 2019 |
Sep. 30, 2017 |
Aug. 31, 2017 |
Aug. 24, 2017 |
| Madryn Credit Agreement |
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| Debt Instrument [Line Items] |
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| Maximum borrowing capacity |
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$ 25,000,000.0
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$ 65,000,000.0
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| Borrowings on credit facility |
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$ 25,000,000.0
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$ 10,000,000.0
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| Outstanding principal balance |
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40,000,000.0
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$ 65,000,000
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$ 65,000,000
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| Default interest rate |
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4.00%
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| Effective interest rate |
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18.40%
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| Weighted average interest rate |
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10.60%
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| Interest expense |
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$ 5,900,000
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$ 4,500,000
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| Fair value of options |
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$ 15,100,000
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| Debt discount |
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1,600,000
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$ 5,000,000.0
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| Legal expenses |
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$ 300,000
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$ 1,300,000
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| 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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8.00%
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11.00%
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| Amended Madryn Credit Agreement |
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| Debt Instrument [Line Items] |
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| Interest expense |
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$ 300,000
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$ 700,000
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| Madryn Credit Agreement - Term A |
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| Debt Instrument [Line Items] |
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| Maximum borrowing capacity |
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$ 30,000,000.0
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| 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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$ 5,000,000.0
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| Madryn Credit Agreement - Term B-2 |
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| Debt Instrument [Line Items] |
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| Borrowings on credit facility |
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$ 5,000,000.0
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| Madryn Credit Agreement - Term B-3 And B-4 |
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| Debt Instrument [Line Items] |
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| Borrowings on credit facility |
$ 25,000,000.0
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| Madryn Credit Agreement - Term B-3 |
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| Debt Instrument [Line Items] |
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| Additional borrowing capacity |
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$ 10,000,000.0
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| Madryn Credit Agreement - Term B-4 |
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| Debt Instrument [Line Items] |
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| Additional borrowing capacity |
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$ 15,000,000.0
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