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Subsequent Event - Additional Information (Detail) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 6 Months Ended | 268 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended
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Jun. 30, 2013 | Jun. 30, 2013 | Jul. 01, 2013 Subsequent Event Deerfield Tranche | Jul. 01, 2013 Subsequent Event Deerfield Maximum | Jul. 01, 2013 Subsequent Event Deerfield Notes 9.75% Due in 2019 | Jul. 01, 2013 Subsequent Event Deerfield Notes 9.75% Due in 2019 Maximum | Jul. 01, 2013 Subsequent Event Deerfield Conversion price exceeds $6.67 | Jul. 01, 2013 Subsequent Event Deerfield Conversion price exceeds $6.67 Maximum | Jul. 01, 2013 Subsequent Event Deerfield Conversion price is less than $3.33 | Jul. 01, 2013 Subsequent Event Deerfield Conversion price is less than $3.33 Maximum | Jul. 01, 2013 Subsequent Event Deerfield Conversion price between $3.33 and 6.67 Maximum
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior secured notes |  |  | $ 160,000,000 |  |  |  |  |  |  |  |
Number of ranches of debt financing |  |  | 4 |  |  |  |  |  |  |  |
Payment in each tranches |  |  | 40,000,000 |  |  |  |  |  |  |  |
Discount of debt issuance |  |  |  |  | 21,100,000 |  |  |  |  |  |
Repayment of outstanding principal amount |  |  |  |  | 25.00% |  |  |  |  |  |
Senior convertible notes, interest rate |  |  |  |  | 9.75% |  |  |  |  |  |
Senior convertible notes, maturity date | Jan. 01, 2014 |  |  |  | Dec. 31, 2019 |  |  |  |  |  |
Conversion trading days |  |  | 20 days |  |  |  |  |  |  |  |
Conversion price of shares |  |  |  |  |  |  | $ 6.67 |  | $ 3.33 |  |
Shares issuable upon conversion |  |  |  |  |  |  |  | 6 |  | 12 |
Shares issuable upon conversion, value |  | 3,331,000 |  |  |  |  |  |  |  |  | 40,000,000
Payment related to milestone right |  |  |  | 90,000,000 |  |  |  |  |  |  |
Milestone agreement payment |  |  |  |  |  | $ 18,900,000 |  |  |  |  |

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- Definition Debt Instruments Purchase Price + References No definition available. + Details
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- Definition Issuance Of Senior Notes Equal Tranches + References No definition available. + Details
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- Definition Number Of Tranches Of Notes + References No definition available. + Details
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- Definition Percentage of Required Payment for Partial Repayment of Debt + References No definition available. + Details
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- Definition Potential Milestone Payment Amount + References No definition available. + Details
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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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