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Facility financing agreement (Tables) | 6 Months Ended
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Jun. 30, 2014
Components of Facility Financing Agreement | The significant activity related to the facility financing agreement during the six months ended June 30, 2014 consist of the following (in thousands):
|  | June 30, 2014 |
Facility financing obligation |  |  |  |
Carrying value at December 31, 2013 |  | $ | 102,300 |
Principal converted to equity |  |  | (93,500 | )
Accretion of debt discount and debt issuance expense |  |  | 7,191 |
Adjustment to debt discount related to modification of the 2019 notes |  |  | 2,921 |
Tranche B principal amount |  |  | 20,000 |
Debt discount related to Tranche B purchase |  |  | (1,168 | )
Net carrying value of facility financing obligation |  | $ | 37,744 |
Commitment Asset |  |  |  |
Commitment asset fair value balance at December 31,2013 |  | $ | 5,157 |
Tranche B commitment asset fair value |  |  | 2,921 |
Less commitment asset portion associated with the receipt of Tranche B notes |  |  | (1,168 | )
Commitment asset value included in other assets |  | $ | 6,910 |
Accretion of Debt Issuance Cost and Debt Discount | Accretion of debt issuance cost and debt discount in connection with the facility financing agreement during the three and six months ended June 30, 2014 are as follows (in thousands):
|  | Three months ended June 30, 2014 |  |  | Six months ended June 30, 2014 |
Accretion expense- debt issuance cost |  | $ | 27 |  |  | $ | 309 |
Accretion expense- debt discount |  | $ | 516 |  |  | $ | 6,883 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of other assets and other liabilities not separately disclosed on the balance sheet. + References No definition available. + Details
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