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Components of Facility Agreement (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Securities Financing Transaction [Line Items] |  |  |  |
Accretion of debt discount and debt issuance expense | $ 231,000 | $ 216,000 | $ 681,000 | $ 637,000
Net carrying value of facility financing obligation | 72,625,000 |  | 72,625,000 |
Commitment asset balance at December 31,2013 | 5,157,000 |  | 5,157,000 |
Commitment asset value included in other assets | 1,753,000 |  | 1,753,000 |
Tranche B notes |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Tranche B commitment asset fair value | 2,921,000 |  | 2,921,000 |
Tranche 4 and Tranche B |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Less commitment asset portion associated with the receipt of Tranche 4 and Tranche B notes | (6,325,000) |  | (6,325,000) |
Facility financing obligation |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Carrying value | 102,300,000 |  | 102,300,000 |
Principal converted to equity | (93,500,000) |  | (93,500,000) |
Accretion of debt discount and debt issuance expense |  |  | 7,507,000 |
Facility financing obligation | Senior convertible notes due December 31, 2019 |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Debt discount |  |  | 2,921,000 |
Facility financing obligation | Tranche B notes |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Carrying value | 20,000,000 |  | 20,000,000 |
Debt discount |  |  | (1,168,000) |
Facility financing obligation | Fourth tranche |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Carrying value | 40,000,000 |  | 40,000,000 |
Debt discount |  |  | $ (5,435,000) |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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