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Common shares, preferred shares and warrants - Additional Information (Detail)
 1 Months Ended 12 Months Ended 17 Months Ended
Oct. 17, 2018
USD ($)
Apr. 09, 2018
USD ($)
shares
Jan. 10, 2018
USD ($)
$ / shares
shares
Nov. 03, 2017
USD ($)
$ / shares
shares
Jun. 08, 2016
shares
Nov. 30, 2017
USD ($)
$ / shares
Oct. 31, 2017
USD ($)
$ / shares
shares
Nov. 30, 2016
investor
$ / shares
shares
May 31, 2016
investor
$ / shares
shares
Dec. 31, 2018
USD ($)
investor
$ / shares
shares
Dec. 31, 2017
USD ($)
investor
$ / shares
shares
Oct. 17, 2017
$ / shares
Jul. 09, 2018
$ / shares
Nov. 02, 2017
$ / shares
Dec. 31, 2016
USD ($)
shares
Equity [Line Items]                              
Common stock, shares issued (in shares)                   76,525,581 61,631,573       53,717,996
Treasury stock, shares (in shares)                   1,233,198 352,523       160,235
Proceeds from issuance of shares, net of issuance costs | $                   $ 13,392,000 $ 0        
Proceeds from exercise of warrants by certain warrant holders | $                   0 3,485,000        
Treasury stock, value | $                   $ 3,272,000 $ 1,274,000       $ 531,000
Preferred stock, shares authorized (in shares)                   10,000,000 10,000,000        
Preferred stock, par value (in dollars per share) | $ / shares                   $ 0.0001 $ 0.0001        
Preferred stock, shares issued (in shares)                   0 0        
Preferred stock, shares outstanding (in shares)                   0 0        
Certain Investors                              
Equity [Line Items]                              
Exercise price of warrants (in dollars per share) | $ / shares                     $ 3.00        
Number of common stock shares that warrants to purchase (in shares)                     1,161,769        
Common Stock                              
Equity [Line Items]                              
Number of common stock issued                   2,700,000          
Registered Direct Offering                              
Equity [Line Items]                              
Exercise price of warrants (in dollars per share) | $ / shares                 $ 8.00            
Warrants outstanding (in shares)                 500,000            
Warrants exercise period                 6 months            
Warrants expiration period                 24 months            
Registered Direct Offering | Certain Investors                              
Equity [Line Items]                              
Exercise price of warrants (in dollars per share) | $ / shares               $ 3.75              
Warrants outstanding (in shares)               1,000,000              
Warrants exercise period               6 months              
Warrants expiration period               5 years              
Registered Direct Offering | Related Agents                              
Equity [Line Items]                              
Exercise price of warrants (in dollars per share) | $ / shares               $ 5.00              
Warrants outstanding (in shares)               100,000              
Number of investors | investor               4              
Warrants exercise period               6 months              
Warrants expiration period               24 months              
Whitehorse Warrants                              
Equity [Line Items]                              
Shares issued from vesting                     300,000        
Exercise price of warrants (in dollars per share) | $ / shares                   $ 3.00       $ 5.08  
Proceeds from exercise of warrants by certain warrant holders | $       $ 900,000             $ 3,484,000        
Warrants outstanding (in shares)       300,000                      
Minimum share price to transfer common stock underlying warrants (in dollars per share) | $ / shares       $ 4.50   $ 4.5             $ 3.8334    
Whitehorse Warrants | Common Stock                              
Equity [Line Items]                              
Proceeds from exercise of warrants by certain warrant holders | $           $ 900,000                  
Warrants Issued To Institutional Investor                              
Equity [Line Items]                              
Warrants outstanding (in shares)                     833,333        
Intracoastal and Anson                              
Equity [Line Items]                              
Number of common stock issued             861,769                
Exercise price of warrants (in dollars per share) | $ / shares             $ 3.00         $ 3      
Number of common stock shares that warrants to purchase (in shares)                 375,000            
Loss recognized into other expenses, net | $                     $ 1,005,000        
Proceeds from exercise of warrants by certain warrant holders | $             $ 2,585,000                
Warrants outstanding (in shares)             861,769       125,000        
Number of investors | investor                 5            
Intracoastal and Anson | Certain Investors                              
Equity [Line Items]                              
Exercise price of warrants (in dollars per share) | $ / shares               $ 3.00   $ 3.75          
Warrants outstanding (in shares)               166,667   2,498,776 1,273,776       2,220,102
Number of investors | investor                   3          
Intracoastal and Anson | Related Agents                              
Equity [Line Items]                              
Exercise price of warrants (in dollars per share) | $ / shares                   $ 5.00          
Warrants outstanding (in shares)                   100,000          
Intracoastal and Anson | Additional Warrants                              
Equity [Line Items]                              
Percentage of additional warrant rights                       25.00%      
Exercise price of warrants (in dollars per share) | $ / shares                     $ 5.35        
Number of common stock shares that warrants to purchase (in shares)                     215,443        
Number of investors | investor                     2        
Q Interactive​, LLC                              
Equity [Line Items]                              
Stock issued related to merger (in shares)       2,750,000                      
Q Interactive​, LLC | Common Stock                              
Equity [Line Items]                              
Stock issued related to merger (in shares)         2,369,190                    
Restricted Stock Units                              
Equity [Line Items]                              
Shares issued from vesting                   12,194,008          
Number of units, withheld as treasury stock (in shares)                   875,675 192,288        
Restricted Stock Units and Restricted Stock                              
Equity [Line Items]                              
Shares issued from vesting                     4,001,808        
Common shares withheld to cover withholding taxes                     192,288        
Number of units, withheld as treasury stock (in shares)                   875,675 192,288        
Registered Direct Offering | Common Stock                              
Equity [Line Items]                              
Number of common stock issued     2,700,000                        
Common stock purchase price per share (in dollars per share) | $ / shares     $ 5.00                        
Proceeds from issuance of shares, net of issuance costs | $     $ 13,392,000                        
Payments of stock issuance costs | $     $ 108,000                        
Registered Direct Offering | Warrant                              
Equity [Line Items]                              
Number of common stock issued     1,350,000                        
Exercise price of warrants (in dollars per share) | $ / shares     $ 6.00                        
Accelerated Vesting Of Restricted Stock Unit                              
Equity [Line Items]                              
Treasury stock, shares acquired   729,167                          
Treasury stock, acquired, cost method | $ $ 5,000 $ 1,581,000                          
Put Rights | Whitehorse Warrants                              
Equity [Line Items]                              
Exercise price of warrants (in dollars per share) | $ / shares                         $ 3.8334    
Minimum | Intracoastal and Anson | Certain Investors                              
Equity [Line Items]                              
Exercise price of warrants (in dollars per share) | $ / shares                   $ 3.75          
Maximum | Intracoastal and Anson | Certain Investors                              
Equity [Line Items]                              
Exercise price of warrants (in dollars per share) | $ / shares                   $ 6.00