Redeemable Convertible Preferred Stock - Additional Information (Detail)		9 Months Ended
	Aug. 16, 2017 USD ($) Installments $ / shares shares	Sep. 30, 2017 $ / shares shares	Dec. 31, 2016 $ / shares shares
Temporary Equity [Line Items]
Number of installments | Installments	9
Percentage of average of three lowest weighted-average prices of common stock	85.00%
Percentage of redeemable preferred stock to be redeemed	125.00%
Late charge percentage per annum on unpaid amount	12.00%
Series B Redeemable Convertible Preferred Stock [Member]
Temporary Equity [Line Items]
Convertible preferred shares, shares issued | shares	15,656	15,656	0
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%
Redeemable Preferred stock, voting rights		Holders of redeemable preferred shares have no voting rights.
Initial conversion price	$ 2.67
Mandatory redeemable preferred stock shares in cash	$ 1,000
Aggregate value of redeemable preferred stock converted on each installment | $	$ 1,739,524
Series B Redeemable Convertible Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Temporary Equity [Line Items]
Beneficial conversion feature | $	$ 3,223,853
Series B Redeemable Convertible Preferred Stock [Member] | Dividend [Member]
Temporary Equity [Line Items]
Initial conversion price	$ 2.67
Series B Redeemable Convertible Preferred Stock [Member] | Maximum [Member]
Temporary Equity [Line Items]
Stock issued for exchange of warrants, shares | shares	2,345,427
Series B Redeemable Convertible Preferred Stock [Member] | Mandatory Conversion [Member]
Temporary Equity [Line Items]
Number of days after preferred stock issuance date that trigger conversion price	10 days
Percentage of current conversion price trigger	200.00%
Mandatorily Redeemable Preferred Stock [Member]
Temporary Equity [Line Items]
Mandatory redeemable preferred stock shares in cash	$ 1,000