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Fair Value of Financial Instruments - Additional Information (Detail) (USD $) | 9 Months Ended |  |  |  |  |  | 0 Months Ended |  |  |  | 9 Months Ended |  | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014 Tranche B notes | Jul. 01, 2013 Senior convertible notes due December 31, 2019 | Feb. 28, 2014 Senior convertible notes due December 31, 2019 Fair Value, Inputs, Level 3 Tranche B notes | Dec. 31, 2013 Senior convertible notes due December 31, 2019 Fair Value, Inputs, Level 3 Income Approach Valuation Technique | Sep. 30, 2014 Senior convertible notes due December 31, 2019 Fair Value, Inputs, Level 3 Income Approach Valuation Technique Tranche B notes | Jul. 01, 2013 Senior convertible notes due December 31, 2019 Fair Value, Inputs, Level 3 Income Approach Valuation Technique Tranche B notes | Sep. 30, 2014 Senior convertible notes due December 31, 2019 Fair Value, Inputs, Level 3 Income Approach Valuation Technique Tranche One and Tranche Four Notes | Jul. 18, 2014 Deerfield Senior convertible notes due December 31, 2019 Tranche B notes | May 06, 2014 Deerfield Senior convertible notes due December 31, 2019 Tranche B notes | Sep. 30, 2014 Deerfield Senior convertible notes due December 31, 2019 Notes Issued in Four Equal Tranches | Sep. 30, 2014 Commitment Asset Fair Value, Inputs, Level 3 Income Approach Valuation Technique | Sep. 30, 2014 Milestone Rights Liability Fair Value, Inputs, Level 3 | Sep. 30, 2014 Milestone Rights Liability Fair Value, Inputs, Level 3 Income Approach Valuation Technique
Fair Value of Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents | $ 172,465,000 | $ 93,803,000 | $ 70,790,000 | $ 61,840,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents, money market funds | 169,700,000 |  | 67,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's longer-term historical volatility rate | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market discount rate |  |  |  |  |  |  |  | 12.70% | 11.90% | 11.90% | 12.40% |  |  |  | 12.00% |  | 17.50%
Fair value of Milestone Rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,100,000 |
Principal amount of notes purchased |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 | 20,000,000 | 160,000,000 |  |  |
Additional commitment asset |  |  |  |  | 2,921,000 | 2,900,000 | 2,900,000 |  |  |  |  |  | 1,800,000 | 0 |  |  |
Percentage of market yield |  |  |  |  |  |  | 11.90% |  |  |  |  |  |  |  |  |  |
Commitment asset, debt discount |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |  |
Transfers of assets between fair value measurement | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers of liabilities between fair value measurement | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Loan Commitment Asset Fair Value + References No definition available. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + 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 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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