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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Assets: |  |
Derivative Asset, Fair Value | $ 135 |
Total assets | 14,656 | 29,007
Liabilities: |  |
Total liabilities | 63,558 | 154,397
Royalty obligation embedded derivative [Member] |  |
Liabilities: |  |
Derivative Liability, Fair Value | 40,338 | 145,098
Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative Liability, Fair Value | 21,630 |
Put and call options [Member] |  |
Assets: |  |
Derivative Asset, Fair Value |  | 943
Liabilities: |  |
Derivative Liability, Fair Value | 1,590 | 9,299
Short-term Deposit [Member] |  |
Assets: |  |
Short-term Deposits |  | 999
Marketable securities [Member] |  |
Assets: |  |
Restricted certificates of deposits | 14,521 | 27,065
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Derivative Asset, Fair Value | 0 |
Total assets | 14,521 | 28,064
Liabilities: |  |
Total liabilities | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Royalty obligation embedded derivative [Member] |  |
Liabilities: |  |
Derivative Liability, Fair Value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative Liability, Fair Value | 0 |
Fair Value, Inputs, Level 1 [Member] | Put and call options [Member] |  |
Assets: |  |
Derivative Asset, Fair Value |  | 0
Liabilities: |  |
Derivative Liability, Fair Value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Short-term Deposit [Member] |  |
Assets: |  |
Short-term Deposits |  | 999
Fair Value, Inputs, Level 1 [Member] | Marketable securities [Member] |  |
Assets: |  |
Restricted certificates of deposits | 14,521 | 27,065
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Derivative Asset, Fair Value | 135 |
Total assets | 135 | 943
Liabilities: |  |
Total liabilities | 1,590 | 154,397
Fair Value, Inputs, Level 2 [Member] | Royalty obligation embedded derivative [Member] |  |
Liabilities: |  |
Derivative Liability, Fair Value | 0 | 145,098
Fair Value, Inputs, Level 2 [Member] | Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative Liability, Fair Value | 0 |
Fair Value, Inputs, Level 2 [Member] | Put and call options [Member] |  |
Assets: |  |
Derivative Asset, Fair Value |  | 943
Liabilities: |  |
Derivative Liability, Fair Value | 1,590 | 9,299
Fair Value, Inputs, Level 2 [Member] | Short-term Deposit [Member] |  |
Assets: |  |
Short-term Deposits |  | 0
Fair Value, Inputs, Level 2 [Member] | Marketable securities [Member] |  |
Assets: |  |
Restricted certificates of deposits | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Derivative Asset, Fair Value | 0 |
Total assets | 0 | 0
Liabilities: |  |
Total liabilities | 61,968 | 0
Fair Value, Inputs, Level 3 [Member] | Royalty obligation embedded derivative [Member] |  |
Liabilities: |  |
Derivative Liability, Fair Value | 40,338 | 0
Fair Value, Inputs, Level 3 [Member] | Royalty Obligation [Member] |  |
Liabilities: |  |
Derivative Liability, Fair Value | 21,630 |
Fair Value, Inputs, Level 3 [Member] | Put and call options [Member] |  |
Assets: |  |
Derivative Asset, Fair Value |  | 0
Liabilities: |  |
Derivative Liability, Fair Value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Short-term Deposit [Member] |  |
Assets: |  |
Short-term Deposits |  | 0
Fair Value, Inputs, Level 3 [Member] | Marketable securities [Member] |  |
Assets: |  |
Restricted certificates of deposits | $ 0 | $ 0

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