Fair Value Measurements (Details) - Recurring - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Assets
Money market funds (cash equivalents)	$ 12,243,104	$ 10,468,570
Total assets	17,349,731	51,092,919
Liabilities
Interest make-whole derivative	55,000	2,400,000
Shape contingent consideration	21,080,000	31,491,686
Common stock warrant liability	64,877	256,027
Total liabilities	21,199,877	34,147,713
Short-term investments
Assets
Investments	5,106,627	40,624,349
Level 1
Assets
Money market funds (cash equivalents)	12,243,104	10,468,570
Total assets	12,243,104	10,468,570
Level 2
Assets
Total assets	5,106,627	40,624,349
Level 2 | Short-term investments
Assets
Investments	5,106,627	40,624,349
Level 3
Liabilities
Interest make-whole derivative	55,000	2,400,000
Shape contingent consideration	21,080,000	31,491,686
Common stock warrant liability	64,877	256,027
Total liabilities	$ 21,199,877	$ 34,147,713