Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Accounting Policies [Line Items]
Cash equivalents maturity description	Three months or less
Investments	$ 0
Allowance for doubtful accounts	9,000	$ 0
Inventory reserve	$ 691,000	0
Shelf life of product	24 months
Advertising expense	$ 700,000	$ 0	$ 0
Carrying value and accrued interest on convertible notes	$ 61,200,000
Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Period of trade accounts receivable considered to be delinquent	90 days
Period of unsalable product returns	6 months
Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Period of unsalable product returns	12 months