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Borrowings - Facility Financing Obligation - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 18, 2019 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2018 | Jul. 01, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  | $ 99,200,000 |  |  |  |
Milestone rights liability |  |  | 7,201,000 |  |  | $ 7,201,000 |
Deerfield | Milestone Rights Liability |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Contingent liability for milestone payments |  |  | 75,000,000 |  |  |  |
Contingent liability for milestone payments, remain payable amount |  |  |  |  |  |  | $ 75,000,000
Deerfield | Milestone Rights Liability | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Contingent liability for milestone payments |  |  | 90,000,000 |  |  |  | 90,000,000
Deerfield | Restricted Cash |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Escrow deposit |  |  | 5,000,000 |  |  |  |
Deerfield | 2019 notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 160,000,000
Debt instrument, remaining borrowing capacity |  |  | 60,000,000 |  |  |  |
Deerfield | 2019 notes | Subsequent Event |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of debt | $ 4,000,000 |  |  |  |  |  |
Deerfield | Facility Financing Obligation |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount |  |  | 9,000,000 |  |  |  |
Conversion of notes to common shares, value |  |  |  |  | $ 100,000,000 |  |
Debt instrument, remaining borrowing capacity |  |  | 80,000,000 |  |  |  |
Debt issuance costs |  |  | 200,000 |  |  |  |
Remaining milestone rights liability |  |  | 8,900,000 |  |  | 8,900,000 |
Required payment for milestone liability |  |  | 5,000,000 |  |  |  |
Milestone rights liability |  |  | 7,200,000 |  |  | 7,200,000 |
Deerfield | Facility Financing Obligation | Scenario Forecast |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Required payment for milestone liability |  | $ 5,000,000 |  |  |  |  |
Deerfield | Facility Financing Obligation | Accrued Expenses and Other Current Liabilities |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Milestone rights liability, current |  |  | 1,600,000 |  |  | $ 1,600,000 |
Deerfield | Tranche B notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instument additional borrowing capacity |  |  |  | $ 20,000,000 |  |  |
Debt instrument, remaining borrowing capacity |  |  | $ 20,000,000 |  |  |  |

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- Definition Milestone rights liabilities current and noncurrent. + References No definition available. + Details
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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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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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