Sale of Sumavel DosePro Business - Net Assets and Calculation of Gain on Sale (Details) (Details) (USD $)	0 Months Ended	12 Months Ended
	May 16, 2014	Dec. 31, 2014	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Imputed interest on working capital advance		$ 5,297,000
Carrying value of Sumavel DosePro inventory on hand at Closing		972,000	1,112,000
Sumavel DosePro [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-contingent consideration received	89,624,000
Imputed interest on working capital advance	4,748,000
Carrying value of Sumavel DosePro inventory on hand at Closing	(4,624,000)
Transaction costs	(660,000)	(660,000)
Deferred revenue associated with undelivered elements	(9,108,000)	(8,535,000)
Net gain on sale of business	$ 79,980,000	$ 79,980,000