Preferred Stock - Additional Information (Detail) - USD ($)			12 Months Ended
	Jul. 11, 2018	Aug. 16, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018	Mar. 31, 2017	Mar. 09, 2017	Jan. 01, 2017	Dec. 31, 2016
Temporary Equity [Line Items]
Convertible preferred shares, shares issued								599,285
Convertible preferred stock, shares outstanding								599,285
Convertible preferred shares, par value								$ 0.01
Stock issued for exchange of warrants, shares							1,659
Deemed dividend			$ 56,792
Common Stock [Member]
Temporary Equity [Line Items]
Conversion of Series B redeemable convertible preferred stock into common stock, shares			502,078	82,483
Second Warrants Exchange [Member]
Temporary Equity [Line Items]
Stock issued for exchange of warrants, shares	22,523
Number of shares issued	32,124
Series B Redeemable Convertible Preferred Stock [Member]
Temporary Equity [Line Items]
Convertible preferred shares, shares issued		15,656	0	12,177
Convertible preferred stock, shares outstanding			0	12,177
Convertible preferred shares, par value		$ 0.0001	$ 0.0001	$ 0.0001
Stock issued for exchange of warrants		$ 14,716,370
Issuance costs incurred		$ 1,697,800
Redeemable preferred stock redemption date		Aug. 16, 2018
Percentage of common stock in reserve for issue on conversion		150.00%
Conversion of redeemable preferred stock into common stock, shares			9,813	3,479
Series B Redeemable Convertible Preferred Stock [Member] | Level 3 [Member]
Temporary Equity [Line Items]
Beneficial conversion feature		$ 1,506,196	$ 1,338,840	$ 167,356
Series B Preferred Stock [Member]
Temporary Equity [Line Items]
Convertible preferred stock, shares outstanding									599,285
Face value of preferred stock					$ 2,364,044
Face value of preferred stock, shares					2,364
Series B Preferred Stock [Member] | Second Warrants Exchange [Member]
Temporary Equity [Line Items]
Number of shares issued	32,124
Proceeds from issuance of warrants	$ 22,241
Deemed contribution			$ 111,553
Maximum [Member]
Temporary Equity [Line Items]
Stock issued for exchange of warrants, shares						1,659
Maximum [Member] | Series B Redeemable Convertible Preferred Stock [Member]
Temporary Equity [Line Items]
Stock issued for exchange of warrants, shares		78,181