Commitments and Contingencies - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Loss Contingencies [Line Items]
Operating lease expiration year				2021
Rent expense				$ 4,600,000	$ 3,300,000
Tenant improvement allowances		$ 100,000	$ 0	100,000	0
Restricted cash		1,665,000		1,665,000		$ 1,665,000	[1]
Purchase commitments		4,500,000		$ 4,500,000		5,800,000
Period of purchase commitment of inventory from specified date				6 months
Loss contingency accrual		0		$ 0		$ 0
Cancelable Lease Agreement [Member]
Loss Contingencies [Line Items]
Motor vehicle lease expenses				2,100,000	$ 2,000,000
Key Employee Settlement [Member]
Loss Contingencies [Line Items]
Loss on settlement of claim	$ 3,400,000
Maximum [Member] | Cancelable Lease Agreement [Member]
Loss Contingencies [Line Items]
Penalties		$ 100,000		$ 100,000

[1] The Condensed Consolidated Balance Sheet as of December 31, 2015 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.