Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Schedule Of Accounting Policies [Line Items]
Cost of goods sold	$ 40,418,000	$ 44,044,000	$ 120,119,000	$ 131,873,000
Capitalized inventories			0		$ 0
Neurolite [Member]
Schedule Of Accounting Policies [Line Items]
Cost of goods sold			$ 0	$ 1,700,000