Fair Value Measurements - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	Jul. 31, 2012	Dec. 31, 2013	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 1 [Member] NAVB Stock [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 1 [Member] NAVB Stock [Member]	Dec. 31, 2012 Fair Value, Measurements, Recurring [Member] Level 1 [Member] FPMI Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments shares			95,000	285,000	39,209
Debt conversion amount	$ 16,000,000	$ 16,000,000