Equity - Schedule of Warrant Activities (Detail) - Common Stock [Member] - $ / shares	9 Months Ended
	Sep. 30, 2019	Jul. 31, 2018
Class of Warrant or Right [Line Items]
Number of Common Shares Issuable under Warrant	95,930	34,062
Warrant One [Member]
Class of Warrant or Right [Line Items]
Warrant Issue date	May 23, 2011
Warrant Term	10 years
Warrants exercise price	$ 1.55
Number of Common Shares Issuable under Warrant	61,868
Warrant Two [Member]
Class of Warrant or Right [Line Items]
Warrant Issue date	Jun. 28, 2013
Warrant Term	10 years
Warrants exercise price	$ 13.22
Number of Common Shares Issuable under Warrant	11,354
Warrant Three [Member]
Class of Warrant or Right [Line Items]
Warrant Issue date	Sep. 30, 2014
Warrant Term	10 years
Warrants exercise price	$ 13.22
Number of Common Shares Issuable under Warrant	22,708