Common Stock - Summary of Stock Options Activity (Detail)	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Optioned Common Shares, Beginning Balance | shares	50,498
Number of Optioned Common Shares, Granted | shares	80,380
Number of Optioned Common Shares, Expired | shares	(2)
Number of Optioned Common Shares, Forfeited | shares	(1,406)
Number of Optioned Common Shares, Ending Balance | shares	129,470
Weighted Average Exercise Price, Beginning Balance | $ / shares	$ 190.46
Weighted Average Exercise Price, Granted | $ / shares	11.02
Expired | $ / shares	31,240.00
Weighted Average Exercise Price, Forfeited | $ / shares	227.61
Weighted Average Exercise Price, Ending Balance | $ / shares	$ 78.18