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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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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Subsequent Event - August 2019 Exchange Agreement - Additional Information (Detail) - USD ($)	Aug. 06, 2019	Jun. 30, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Common stock, shares issued		189,447,055	187,029,967
2019 Notes Tranche 1 \| Subsequent Event
Subsequent Event [Line Items]
Maturity date	Mar. 31, 2019
2019 Notes Tranche 1 \| Subsequent Event \| Deerfield
Subsequent Event [Line Items]
Repayments of aggregate principal amount	$ 2,000,000
Common stock, shares issued	2,678,571
Conversion of notes to common shares, value	$ 3,000,000