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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

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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.

+ 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=120391452&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	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Number of shares of common stock (in shares)	19,299,228	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)	$ 92,310
Original Exercise Price \| 2018 Deerfield Warrants
Debt Instrument [Line Items]
Exercise price (usd per share)	47,110
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