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Common Stock and Warrants - Additional Information (Details)
$ / shares in Units, $ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2018
CAD ($)
shares
Nov. 30, 2018
USD ($)
$ / shares
shares
Nov. 19, 2018
USD ($)
$ / shares
shares
Apr. 24, 2018
USD ($)
$ / shares
Apr. 24, 2018
USD ($)
$ / shares
shares
Apr. 13, 2018
USD ($)
$ / shares
shares
Apr. 02, 2018
USD ($)
Apr. 01, 2018
USD ($)
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. 31, 2017
USD ($)
Tranche
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
Tranche
$ / shares
shares
Apr. 13, 2018
$ / shares
shares
Schedule Of Stockholders Equity [Line Items]                                          
Common stock, shares authorized | shares                                     150,000,000    
Common stock, par value | $ / shares                                     $ 0.001    
Preferred stock, shares authorized | shares                                   0 10,000,000 0  
Preferred stock, par value | $ / shares                                   $ 0.001 $ 0.001 $ 0.001  
Common share, voting rights                                     one vote per share    
Common share, dividends declared                                     $ 0    
Share issuance cost and commission paid                                     3,161,000 $ 1,248,000  
Gian (loss) change in fair value of derivative financial instruments                                     (3,577,000) (3,443,000)  
Gross proceeds from issuance of common stock                                     $ 38,526,000 $ 20,878,000  
Class of warrants exercised | shares 70,900                                        
Proceeds received from exercise of outstanding warrants $ 0.9                                        
Derivative Financial Instruments Liabilities                                          
Schedule Of Stockholders Equity [Line Items]                                          
Fair value of warrants             $ 2,500,000                            
Warrants Expiration Date, April 18, 2019                                          
Schedule Of Stockholders Equity [Line Items]                                          
Warrant exercisable price per share | $ / shares                                     $ 12.25    
Warrants expiration date                                     Dec. 28, 2020    
April 2016 Offering                                          
Schedule Of Stockholders Equity [Line Items]                                          
Proceeds from issuance of units                               $ 7,200,000          
Price per share | $ / shares                                 $ 5.00        
Warrant exercisable price per share | $ / shares                                 $ 7.50        
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          
Gian (loss) change in fair value of derivative financial instruments               $ (3,300,000)                          
Increase in derivative financial instruments               4,700,000                          
Reduction in additional paid in capital               $ 1,400,000                          
April 2016 Offering | Warrants Expiration Date, April 18, 2019                                          
Schedule Of Stockholders Equity [Line Items]                                          
Description of units issued                                     Each Unit consists of one share of common stock 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 | (per share)   $ 8.25   $ 7.47 $ 7.47                   $ 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              
Gross proceeds from issuance of common stock   $ 2,600,000     $ 2,400,000                                
Over-Allotment Option | Common Stock                                          
Schedule Of Stockholders Equity [Line Items]                                          
Issuance of common stock in public offering | shares   318,182     321,285                                
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    
Short Form Prospectus Offering in Canada and U.S. Private Placement and Over-Allotment Option                                          
Schedule Of Stockholders Equity [Line Items]                                          
Gian (loss) change in fair value of derivative financial instruments                                     $ 100,000    
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   $ 9.80  
Description of units issued                                     Each unit consisted of one share of common stock and one share purchase warrant, and was sold at a price of $9.80 per unit.    
Number of common stock converted by each warrant | shares                                   1   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   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                        
April 2018 Offering                                          
Schedule Of Stockholders Equity [Line Items]                                          
Price per share | $ / shares           $ 7.47                              
Warrant exercisable price per share | $ / shares                                         $ 12.25
Warrants expiration date           Apr. 10, 2021                              
Number of common stock converted by each warrant | shares           1                             1
Gross proceeds from issuance of common stock           $ 16,000,000                              
Warrants to purchase number of common stock, shares | shares           2,141,900                             2,141,900
Underwriting discounts and commissions paid       $ 1,100,000                                  
Offering expenses incurred       1,000,000                                  
Net proceeds from offering       16,300,000                                  
Underwriting Discounts And Offering Expenses       $ 800,000                                  
Fair value of warrants at issuance           $ 7,400,000                              
April 2018 Offering | Common Stock                                          
Schedule Of Stockholders Equity [Line Items]                                          
Issuance of common stock in public offering | shares           2,141,900                              
November 2018 Offering                                          
Schedule Of Stockholders Equity [Line Items]                                          
Price per share | $ / shares     $ 8.25                                    
Gross proceeds from issuance of common stock     $ 17,500,000                                    
Underwriting discounts and commissions paid   $ 1,200,000                                      
Offering expenses incurred   700,000                                      
Net proceeds from offering   $ 18,300,000                                      
Accrued share issuance cost                                     $ 100,000    
November 2018 Offering | Common Stock                                          
Schedule Of Stockholders Equity [Line Items]                                          
Issuance of common stock in public offering | shares     2,121,212