Takeda Termination and Transition Agreement (Narrative) (Details) (USD $)	3 Months Ended
Mar. 31, 2013
Takeda Termination And Transition Agreement Narrative Details
Shares of Common Stock issued	6,100,000
Value of Common Stock issued	$ 54,900,000
Future milestone payment in cash or common stock	30,000,000
Milestone payment trigger amount on worldwide net sales	750,000,000
Assets acquired:
Revestive raw materials	15,900,000
PTH raw materials	20,700,000
Revestive product rights	$ 18,200,000

Gross carrying amount before accumulated amortization as of the balance sheet date of an intangible asset that arises from a contractual arrangement with a third party (not including franchise rights and license agreements).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant