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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Per share or per unit amount of equity securities issued.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Subsequent Event - July 2019 Exchange Agreement - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	Jul. 18, 2019	Jul. 17, 2019	Jun. 30, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Common stock, shares issued			189,447,055	187,029,967
2019 Notes Tranch 4 \| Subsequent Event
Subsequent Event [Line Items]
Maturity date	Jul. 18, 2019
2019 Notes Tranch 4 \| Subsequent Event \| Deerfield
Subsequent Event [Line Items]
Repayments of aggregate principal amount	$ 2.4
Common stock, shares issued	1,514,423
Exchange price per share		$ 1.04
Conversion of notes to common shares, value	$ 1.6