Other Assets - Summary of Other Assets (Detail) (USD $)	Sep. 30, 2013	Apr. 10, 2013	Dec. 31, 2012
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid initial public offering costs			$ 2,257,000
Prepaid distribution fees	127,000		134,000
Deferred financing costs	195,000	24,000	261,000
Deposit for equipment	463,000
Deposits on equipment leases	184,000		43,000
Other assets	88,000		90,000
Other assets, total	$ 1,057,000		$ 2,785,000