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Borrowings - Deerfield Facility Financing Obligation - Additional Information (Detail) - USD ($) |  | 12 Months Ended | 24 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 18, 2019 | Dec. 31, 2019 | Dec. 31, 2014 | Dec. 31, 2014 | Jun. 30, 2019 | Dec. 31, 2018 | Jul. 01, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  | $ 120,300,000 |  |  |  |  |
Common stock, shares issued |  | 211,787,573 |  |  |  | 187,029,967 |
2019 notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized debt issuance costs and debt discount |  | $ 0 |  |  |  | $ 200,000 |
Deerfield | 2019 notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 160,000,000
Senior notes, effective interest rate |  |  |  |  |  |  | 9.75%
Conversion of notes to common shares, value | $ 1,600,000 |  |  |  |  |  |
Debt instrument, remaining borrowing capacity |  | 60,000,000 |  |  |  |  |
Repayments of aggregate principal amount | $ 2,400,000 |  |  |  |  |  |
Common stock, shares issued | 1,514,423 |  |  |  |  |  |
Deerfield | Facility Financing Obligation |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Conversion of notes to common shares, value |  |  |  | $ 100,000,000 |  |  |
Repayments of aggregate principal amount |  | 5,000,000 |  |  |  |  |
Deerfield | Tranche B notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes, effective interest rate |  |  | 8.75% | 8.75% |  |  |
Debt instrument additional borrowing capacity |  |  | $ 20,000,000 |  |  |  |
Debt instrument, remaining borrowing capacity |  | 20,000,000 |  |  |  |  |
Deerfield | Facility Financing Obligation |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 9,000,000 |  |
Debt instrument, remaining borrowing capacity |  | $ 80,000,000 |  |  |  |  |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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