Agreements (Details 7) (USD $)	3 Months Ended								12 Months Ended				19 Months Ended		1 Months Ended	12 Months Ended	19 Months Ended							19 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2013 Lilly	Jun. 30, 2013 Lilly	Jun. 30, 2013 Lilly Sales milestones	Dec. 31, 2011 Lilly Right-to-test agreement	Jun. 30, 2013 Lilly Development and Commercialization License	Jun. 30, 2013 Lilly Development and Commercialization License	Dec. 31, 2011 Lilly Development and Commercialization License	Dec. 31, 2011 Lilly Development and Commercialization License Maximum	Jun. 30, 2013 Lilly Development and Commercialization License Phase I clinical trial	Dec. 31, 2011 Lilly Development and Commercialization License Development milestones	Dec. 31, 2011 Lilly Development and Commercialization License Regulatory milestones	Dec. 31, 2011 Lilly Development and Commercialization License Sales milestones	Jun. 30, 2013 Lilly Future Technological Improvements	Jun. 30, 2013 Lilly Research Services
Collaborative Agreements disclosures
Term of agreement															3 years
Payments received under collaboration agreement													$ 28,200,000	$ 800,000	$ 20,000,000		$ 23,500,000							$ 600,000	$ 3,300,000
Potential milestone payments receivable																			200,500,000	5,000,000	30,500,000	70,000,000	100,000,000
License exercise fee, for second license																2,000,000	2,000,000
License exercise fee, per subsequent license																		2,000,000
Potential milestone payments receivable for each subsequent license under agreement																			199,000,000		29,000,000	70,000,000	100,000,000
Allocation of fees to deliverables
Estimated utilization period after commercialization												10 years
Discount rate (as a percent)												16.00%
License and milestone fees	$ 855,000	$ 22,010,000	$ 429,000	$ 933,000	$ 950,000	$ 999,000	$ 6,025,000	$ 1,187,000	$ 24,227,000	$ 9,161,000	$ 6,393,000
Estimated term of development and commercialization license																25 years