Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 USD ($)
Accounting Policies [Abstract]
Write-down of inventory	$ 19,000
Acquired Indefinite-lived Intangible Assets [Line Items]
Impairment of goodwill	$ 0
Minimum [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	5 years
Maximum [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	12 years