Stock Purchase Warrants - Additional Information (Detail) - Warrant [Member]	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Class of Warrant or Right [Line Items]
Warrants redeemable into common shares	60,000
Warrants exercisable date	May 01, 2015
Exercise price of warrants | $ / shares	$ 10.00
Warrants expiration date	May 01, 2019
Class of warrants issued and expired unexercised	40,300
Number outstanding	0