Commitments and Contingencies - Manufacturing and Supply - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Agreement termination year	2018
Additional manufacturing cell cost	$ 2,350,000
Impairment of property and equipment	8,591,000	$ 0
Additional cost of goods sold related to inventory	1,229,000
Prepayments to supplier for lower housing assembly	$ 1,024,000