Fair Value Measurements - Summary of Financial Asset Measured at Fair Value (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	$ 196,650	$ 838,309
Total assets	196,650	838,309
Contingent royalty		16,000,000
Total liabilities		16,000,000
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities	196,650	838,309
Total assets	196,650	838,309
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale securities
Total assets
Contingent royalty
Total liabilities
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent royalty		16,000,000
Total liabilities		$ 16,000,000