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Common Stock and Warrants - Additional Information (Detail)
 1 Months Ended 3 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 ($)
shares
May 02, 2016
USD ($)
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
Mar. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
Mar. 31, 2018
$ / 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      
Share issuance cost and commission paid                           73,000 $ 1,239,000    
Gross proceeds from issuance of common stock                           $ 0 $ 9,187,000    
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                
Share 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                    
Share 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      
Public Offering | Common Stock                                  
Schedule Of Stockholders Equity [Line Items]                                  
Share 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                        
Private Placement                                  
Schedule Of Stockholders Equity [Line Items]                                  
Proceeds from issuance of units                       $ 3,655,000          
Number of shares issued in transaction | shares                       372,956          
Private Placement | Common Stock                                  
Schedule Of Stockholders Equity [Line Items]                                  
Proceeds from issuance of units       $ 5,400,000                          
Share issuance cost and commission paid       $ 9,000                          
Number of shares issued in transaction | shares       800,000                          
December 2017 Financing                                  
Schedule Of Stockholders Equity [Line Items]                                  
Proceeds from issuance of units                       $ 6,300,000          
Price per share | $ / shares                       $ 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          
Share issuance cost and commission paid                       $ 100,000          
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          
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                         208,333 555,556      
Class of warrant or right exercise price per share | $ / shares                         $ 7.20 $ 6.75      
Proceeds received from exercise of outstanding warrants                         $ 1,500,000 $ 3,800,000      
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