Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

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.

+ 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(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Credit Facilities (Deerfield Warrants) (Details) - $ / shares	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Number of shares of common stock (in shares)	19,215,059	18,190,054
2017 Deerfield Warrants
Debt Instrument [Line Items]
Number of shares of common stock (in shares)	647,001,000
2018 Deerfield Warrants
Debt Instrument [Line Items]
Number of shares of common stock (in shares)	875,001
Original Exercise Price \| 2017 Deerfield Warrants
Debt Instrument [Line Items]
Exercise price (usd per share)	$ 92,306.000
Original Exercise Price \| 2018 Deerfield Warrants
Debt Instrument [Line Items]
Exercise price (usd per share)	47,106.000
Second Amendment Exercise price
Debt Instrument [Line Items]
Exercise price (usd per share)	6.61
Second Amendment Exercise price \| 2017 Deerfield Warrants
Debt Instrument [Line Items]
Exercise price (usd per share)	6.61
Second Amendment Exercise price \| 2018 Deerfield Warrants
Debt Instrument [Line Items]
Exercise price (usd per share)	6.61
Fourth Amendment Price [Member] \| 2017 Deerfield Warrants
Debt Instrument [Line Items]
Exercise price (usd per share)	1.5
Fourth Amendment Price [Member] \| 2018 Deerfield Warrants
Debt Instrument [Line Items]
Exercise price (usd per share)	$ 1.5