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Summary of Significant Accounting Policies - Summary of Significant Accounts Receivable (Detail) (Accounts Receivable [Member]) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Gilead [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Significant Accounts Receivable | 51.20% |  |
Pfizer [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Significant Accounts Receivable | 22.60% | 45.40% | 28.00%
Boehringer [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Significant Accounts Receivable | 11.10% | 18.00% | 40.10%
Eli Lilly [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Significant Accounts Receivable | 11.00% | 28.20% | 10.60%
Government Agencies [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Significant Accounts Receivable | 4.00% | 8.40% | 21.30%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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