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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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Debt instrument additional borrowing capacity.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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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.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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