Common Stock and Warrants - Additional Information (Detail)													1 Months Ended		9 Months Ended	12 Months Ended
	Dec. 29, 2017 USD ($) shares	Dec. 28, 2017 USD ($) shares	Dec. 22, 2017 USD ($) shares	Jun. 28, 2017 USD ($) shares	Feb. 16, 2017 USD ($) shares	Jun. 06, 2016 USD ($) shares	May 02, 2016 USD ($) shares	May 02, 2016 $ / shares shares	Apr. 18, 2016 USD ($) shares	Apr. 18, 2016 $ / shares shares	Dec. 29, 2015 USD ($) $ / shares shares	Nov. 30, 2015 $ / shares shares	Dec. 31, 2017 USD ($) Tranche $ / shares shares	Nov. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) Tranche $ / shares shares	Dec. 31, 2017 $ / shares	Oct. 09, 2015 USD ($)
Schedule Of Stockholders Equity [Line Items]
Class A common share, voting rights																One vote per share
Class A common share, dividends declared																$ 0
Cash issuance cost and commission paid															$ 1,509,000	1,248,000
Gross proceeds from issuance of common stock															$ 7,903,000	$ 20,878,000
Common Stock
Schedule Of Stockholders Equity [Line Items]
Issuance of common stock in public offering | shares																1,311,000
Warrants Expiration Date, April 18, 2019
Schedule Of Stockholders Equity [Line Items]
Warrant exercisable price per share | $ / shares																	$ 7.50
Warrants expiration date																Apr. 18, 2019
Short Form Prospectus Offering in Canada and U.S. Private Placement
Schedule Of Stockholders Equity [Line Items]
Warrant exercisable price per share | $ / shares										$ 7.50
Proceeds from issuance of units									$ 7,200,000
Price per share | $ / shares										$ 5.00
Warrants expiration date																Apr. 18, 2019
Number of common stock converted by each warrant | shares										1
Cash issuance cost and commission paid									$ 300,000
Options exercisable to purchase units | shares									87,210
Options exercise price per unit | $ / shares										$ 5.00
Offering expiration period									24 months
Other cash issuance costs related to offering									$ 1,100,000
Short Form Prospectus Offering in Canada and U.S. Private Placement | Warrants Expiration Date, April 18, 2019
Schedule Of Stockholders Equity [Line Items]
Description of units issued																Each Unit consists of one Class A common share in the capital of the Company (a “Common Share’) and one half of one Common Share purchase warrant (each whole warrant, a “Warrant”).
Over-Allotment Option
Schedule Of Stockholders Equity [Line Items]
Proceeds from issuance of units							$ 8,100,000
Price per share | $ / shares								$ 5.00
Warrants expiration date																Apr. 18, 2019
Number of common stock converted by each warrant | shares								1
Cash issuance cost and commission paid							$ 100,000
Options exercisable to purchase units | shares							13,081
Options exercise price per unit | $ / shares								$ 5.00
Offering expiration period							24 months
Number of shares issued in transaction | shares							218,025
Gross proceeds from issuance of units							$ 900,000
Over-Allotment Option | Warrants Expiration Date, April 18, 2019
Schedule Of Stockholders Equity [Line Items]
Description of units issued																Each over-allotment warrant entitles the holder thereof to acquire one additional over-allotment Common Share at an exercise price of CAD $7.50 on or before April 18, 2019
Private Placement
Schedule Of Stockholders Equity [Line Items]
Class of warrants exercised | shares						365,120
Proceeds received from exercise of outstanding warrants						$ 1,400,000
Proceeds from issuance of units													$ 3,655,000
Number of shares issued in transaction | shares													372,956
Warrants expired unexercised | shares						1,320,880
Private Placement | Common Stock
Schedule Of Stockholders Equity [Line Items]
Proceeds from issuance of units				$ 5,400,000
Cash issuance cost and commission paid				$ 9,000
Number of shares issued in transaction | shares				800,000
Public Offering | Common Stock
Schedule Of Stockholders Equity [Line Items]
Cash issuance cost and commission paid					$ 1,200,000
Issuance of common stock in public offering | shares					1,311,000
Gross proceeds from issuance of common stock					$ 9,200,000
December 2017 Financing
Schedule Of Stockholders Equity [Line Items]
Proceeds from issuance of units													$ 6,300,000
Price per share | $ / shares													$ 9.80			$ 9.80
Description of units issued																Each unit consisted of one share of Class A common stock of the Company at a price of $9.80 per share, and one share purchase warrant.
Number of common stock converted by each warrant | shares													1			1
Options exercise price per unit | $ / shares													$ 12.25
Offering expiration period													36 months
Number of shares issued in transaction | shares													646,016
Number of tranches | Tranche													3			3
Accrued share issuance cost													$ 100,000			$ 100,000
December 2017 Financing | Tranche One
Schedule Of Stockholders Equity [Line Items]
Proceeds from issuance of units			$ 2,600,000
Number of shares issued in transaction | shares			270,915
December 2017 Financing | Tranche Two
Schedule Of Stockholders Equity [Line Items]
Proceeds from issuance of units		$ 1,700,000
Number of shares issued in transaction | shares		171,020
December 2017 Financing | Tranche Three
Schedule Of Stockholders Equity [Line Items]
Proceeds from issuance of units	$ 2,000,000
Number of shares issued in transaction | shares	204,081
$2.0 million note
Schedule Of Stockholders Equity [Line Items]
Debt conversion, converted instrument, shares issued | shares												416,666
Common stock conversion price per share | $ / shares												$ 4.80
Warrants exercisable | shares												208,333
Warrant exercisable price per share | $ / shares												$ 7.20
Warrants exercisable period												3 years
Additional funding commitment
Schedule Of Stockholders Equity [Line Items]
Debt conversion, original debt, amount											$ 5,000,000
Debt conversion, converted instrument, shares issued | shares											1,111,111
Common stock conversion price per share | $ / shares											$ 4.50
Warrants exercisable | shares											555,556
Warrant exercisable price per share | $ / shares											$ 6.75
Warrants exercisable period											3 years
A&B Company Limited
Schedule Of Stockholders Equity [Line Items]
Class of warrants exercised | shares														208,333
Class of warrant or right exercise price per share | $ / shares														$ 7.20
Proceeds received from exercise of outstanding warrants														$ 1,500,000
A&B Company Limited | Private Placement
Schedule Of Stockholders Equity [Line Items]
Proceeds from issuance of units													$ 2,000,000
Number of shares issued in transaction | shares													204,081
Asset Purchase Agreement | A&B Company Limited
Schedule Of Stockholders Equity [Line Items]
Convertible promissory note																		$ 7,000,000
Asset Purchase Agreement | A&B Company Limited | $2.0 million note
Schedule Of Stockholders Equity [Line Items]
Convertible promissory note																		2,000,000
Asset Purchase Agreement | A&B Company Limited | Additional funding commitment
Schedule Of Stockholders Equity [Line Items]
Convertible promissory note																		$ 5,000,000