Property and Equipment, net - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014
Property Plant And Equipment [Line Items]
Impairment of Long-Lived Assets to be Disposed of		$ 400,000
Woburn, MA Manufacturing Facility [Member]
Property Plant And Equipment [Line Items]
Impairment of Long-Lived Assets to be Disposed of	$ 0	$ 400,000