Financial Instruments (Fair Value Measurements) (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets:
Assets, fair value	$ 16,521	$ 13,960
Liabilities:
Liabilities, fair value	23,869	23,647
Current portion of contingent liabilities - CyDex [Member]
Liabilities:
Liabilities, fair value	1,879	356
Current portion of co-promote termination liability [Member]
Liabilities:
Liabilities, fair value	4,507	4,327
Long-term portion of contingent liabilities-Metabasis [Member]
Liabilities:
Liabilities, fair value	1,736
Long-term portion of contingent liabilities - CyDex [Member]
Liabilities:
Liabilities, fair value	6,816	10,543
Liability for restricted investments owed to former licensees [Member]
Liabilities:
Liabilities, fair value	544	214
Long-term portion of co-promote termination liability [Member]
Liabilities:
Liabilities, fair value	8,387	8,207
Current portion of co-promote termination payments receivable [Member]
Assets:
Assets, fair value	4,507	4,327
Available-for-sale securities [Member]
Assets:
Assets, fair value	3,627	1,426
Long-term portion of co-promote termination payments receivable [Member]
Assets:
Assets, fair value	8,387	8,207
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Assets, fair value
Liabilities:
Liabilities, fair value	1,736
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Current portion of contingent liabilities - CyDex [Member]
Liabilities:
Liabilities, fair value
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Current portion of co-promote termination liability [Member]
Liabilities:
Liabilities, fair value
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term portion of contingent liabilities-Metabasis [Member]
Liabilities:
Liabilities, fair value	1,736
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term portion of contingent liabilities - CyDex [Member]
Liabilities:
Liabilities, fair value
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Liability for restricted investments owed to former licensees [Member]
Liabilities:
Liabilities, fair value
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term portion of co-promote termination liability [Member]
Liabilities:
Liabilities, fair value
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Current portion of co-promote termination payments receivable [Member]
Assets:
Assets, fair value
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Available-for-sale securities [Member]
Assets:
Assets, fair value
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term portion of co-promote termination payments receivable [Member]
Assets:
Assets, fair value
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Assets, fair value
Liabilities:
Liabilities, fair value
Significant Other Observable Inputs (Level 2) [Member] | Current portion of contingent liabilities - CyDex [Member]
Liabilities:
Liabilities, fair value
Significant Other Observable Inputs (Level 2) [Member] | Current portion of co-promote termination liability [Member]
Liabilities:
Liabilities, fair value
Significant Other Observable Inputs (Level 2) [Member] | Long-term portion of contingent liabilities-Metabasis [Member]
Liabilities:
Liabilities, fair value
Significant Other Observable Inputs (Level 2) [Member] | Long-term portion of contingent liabilities - CyDex [Member]
Liabilities:
Liabilities, fair value
Significant Other Observable Inputs (Level 2) [Member] | Liability for restricted investments owed to former licensees [Member]
Liabilities:
Liabilities, fair value
Significant Other Observable Inputs (Level 2) [Member] | Long-term portion of co-promote termination liability [Member]
Liabilities:
Liabilities, fair value
Significant Other Observable Inputs (Level 2) [Member] | Current portion of co-promote termination payments receivable [Member]
Assets:
Assets, fair value
Significant Other Observable Inputs (Level 2) [Member] | Available-for-sale securities [Member]
Assets:
Assets, fair value
Significant Other Observable Inputs (Level 2) [Member] | Long-term portion of co-promote termination payments receivable [Member]
Assets:
Assets, fair value
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Assets, fair value	16,521	13,960
Liabilities:
Liabilities, fair value	22,133	23,647
Significant Unobservable Inputs (Level 3) [Member] | Current portion of contingent liabilities - CyDex [Member]
Liabilities:
Liabilities, fair value	1,879	356
Significant Unobservable Inputs (Level 3) [Member] | Current portion of co-promote termination liability [Member]
Liabilities:
Liabilities, fair value	4,507	4,327
Significant Unobservable Inputs (Level 3) [Member] | Long-term portion of contingent liabilities-Metabasis [Member]
Liabilities:
Liabilities, fair value
Significant Unobservable Inputs (Level 3) [Member] | Long-term portion of contingent liabilities - CyDex [Member]
Liabilities:
Liabilities, fair value	6,816	10,543
Significant Unobservable Inputs (Level 3) [Member] | Liability for restricted investments owed to former licensees [Member]
Liabilities:
Liabilities, fair value	544	214
Significant Unobservable Inputs (Level 3) [Member] | Long-term portion of co-promote termination liability [Member]
Liabilities:
Liabilities, fair value	8,387	8,207
Significant Unobservable Inputs (Level 3) [Member] | Current portion of co-promote termination payments receivable [Member]
Assets:
Assets, fair value	4,507	4,327
Significant Unobservable Inputs (Level 3) [Member] | Available-for-sale securities [Member]
Assets:
Assets, fair value	3,627	1,426
Significant Unobservable Inputs (Level 3) [Member] | Long-term portion of co-promote termination payments receivable [Member]
Assets:
Assets, fair value	$ 8,387	$ 8,207