Acquisition of Revivicor, Inc. (Details) (USD $)		1 Months Ended
	Sep. 30, 2011	Jul. 31, 2011 Revivicor, Inc. Y	Jul. 11, 2011 Revivicor, Inc.
Acquisitions
Percentage of outstanding stock acquired (as a percent)			100.00%
Initial payment in cash			$ 3,500,000
Contingent consideration at fair value			3,400,000
Consideration upon achievement of specific developmental and regulatory milestones			25,000,000
Assets acquired
Current assets			306,000
Property, plant and equipment			286,000
Identifiable intangible assets			7,100,000
Goodwill	3,500,000		3,472,000
Total assets acquired			11,164,000
Liabilities assumed
Accrued expenses			713,000
Deferred revenue			2,424,000
Total liabilities assumed			$ 3,137,000
Estimated amortizable economic life of contract-based intangible assets (in years)		20