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Common shares, preferred shares and warrants - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Nov. 03, 2017
USD ($)
shares
Jun. 08, 2016
shares
Mar. 11, 2016
$ / shares
shares
Feb. 22, 2016
shares
Nov. 30, 2017
USD ($)
shares
Oct. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Nov. 30, 2016
$ / shares
shares
May 31, 2016
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
Stockholder
Warrantholder
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Nov. 02, 2017
$ / shares
Oct. 17, 2017
$ / shares
Dec. 08, 2015
USD ($)
$ / shares
shares
Mar. 19, 2015
shares
Equity [Line Items]                                  
Common stock, shares issued             53,717,996       61,631,573 53,717,996          
Treasury stock, shares             160,235       352,523 160,235          
Proceeds from exercise of warrants by certain warrant holders | $                     $ 3,485            
Loss recognized into other expenses, net | $                     $ 1,005 $ 1,497          
Preferred stock, par value | $ / shares             $ 0.0001       $ 0.0001 $ 0.0001          
Warrants issued in relation to term loan | $                   $ 492   $ 492 $ 1,586        
Preferred stock, shares authorized             10,000,000       10,000,000 10,000,000         10,000,000
Preferred stock, shares issued             0       0 0          
Preferred stock, shares outstanding             0       0 0          
Treasury stock, value | $             $ 531       $ 1,274 $ 531          
Term Loan [Member]                                  
Equity [Line Items]                                  
Term Loan | $                               $ 45,000  
Certain Investors [Member]                                  
Equity [Line Items]                                  
Exercise price of warrants | $ / shares                     $ 3.00            
Number of common stock shares that warrants to purchase                     1,161,769            
Series A Earn-out Shares [Member] | Certain Investors [Member]                                  
Equity [Line Items]                                  
Common stock, shares issued     1,800,220                            
Common Stock [Member]                                  
Equity [Line Items]                                  
Issuance of common shares to vendors for services rendered, shares                       14,500 45,000        
Issuance of common shares upon exercise of warrants, shares                       1,069,728 20,122        
Common Stock [Member] | Certain Investors [Member]                                  
Equity [Line Items]                                  
Issuance of shares, net of offering costs, shares                       3,000,000          
Common Stock [Member] | Certain Investors [Member]                                  
Equity [Line Items]                                  
Issuance of shares, net of offering costs, shares                       3,000,000          
Exchangeable Shares [Member]                                  
Equity [Line Items]                                  
Issuance of shares, net of offering costs, shares                       1,069,728          
Number of common stock shares that warrants to purchase             320,102         320,102          
Number of stockholders that the exchange warrants were previously issued to | Stockholder                       4          
Other expenses, net | $                       $ 1,273          
Number of new warrants holders | Warrantholder                       1          
Series B Preferred Stock [Member]                                  
Equity [Line Items]                                  
Preferred stock to be converted       450,962                          
Common stock, shares issued upon conversion       22,548,100                       50  
Ratio of conversion       50                          
Preferred stock, par value | $ / shares                               $ 0.0001  
Preferred stock, shares authorized             1,000,000       1,000,000 1,000,000          
Preferred stock, shares issued                               100  
Series A Preferred Stock [Member]                                  
Equity [Line Items]                                  
Preferred stock to be converted     6,672,022                            
Preferred stock, conversion basis     One-for-one basis                            
Preferred stock, shares authorized             6,800,000       6,800,000 6,800,000          
Series A Preferred Stock [Member] | Certain Investors [Member]                                  
Equity [Line Items]                                  
Common stock, shares issued upon conversion     1,800,220                            
Whitehorse Warrants [Member]                                  
Equity [Line Items]                                  
Warrants outstanding 300,000                 100,000           200,000  
Exercise price of warrants | $ / shares                   $ 5.08 $ 3.00     $ 5.08   $ 8.00  
Proceeds from exercise of warrants by certain warrant holders | $ $ 900                   $ 3,485            
Number of common stock shares that warrants to purchase                   100,000 1,161,769         200,000  
Warrants issued in relation to term loan | $                   $ 492              
Warrant expiration date                     Sep. 30, 2026            
Whitehorse Warrants [Member] | Common Stock [Member]                                  
Equity [Line Items]                                  
Proceeds from exercise of warrants by certain warrant holders | $         $ 900                        
Issuance of common shares upon exercise of warrants, shares         300,000           300,000            
New Warrant [Member] | Exchangeable Shares [Member]                                  
Equity [Line Items]                                  
Exercise price of warrants | $ / shares             $ 10.00         $ 10.00          
Number of common stock shares that warrants to purchase             320,102         320,102          
Warrants Issued To Institutional Investor [Member]                                  
Equity [Line Items]                                  
Warrants outstanding             2,220,102       1,273,776 2,220,102          
Registered Direct Offering [Member]                                  
Equity [Line Items]                                  
Warrants outstanding                 500,000                
Exercise price of warrants | $ / shares                 $ 8.00                
Warrants expiration period                 24 months                
Warrants exercise period                 6 months                
Registered Direct Offering [Member] | Certain Investors [Member]                                  
Equity [Line Items]                                  
Warrants outstanding               1,000,000                  
Exercise price of warrants | $ / shares               $ 3.75                  
Warrants expiration period               5 years                  
Warrants exercise period               6 months                  
Registered Direct Offering [Member] | Related Agents [Member]                                  
Equity [Line Items]                                  
Warrants outstanding               100,000                  
Exercise price of warrants | $ / shares               $ 5.00                  
Warrants expiration period               24 months                  
Warrants exercise period               6 months                  
Intracoastal and Anson [Member]                                  
Equity [Line Items]                                  
Warrants outstanding           861,769         125,000            
Exercise price of warrants | $ / shares           $ 3.00                 $ 3.00    
Issuance of shares, net of offering costs, shares           861,769                      
Proceeds from exercise of warrants by certain warrant holders | $           $ 2,585                      
Number of common stock shares that warrants to purchase                 375,000                
Loss recognized into other expenses, net | $                     $ 1,005            
Intracoastal and Anson [Member] | Certain Investors [Member]                                  
Equity [Line Items]                                  
Warrants outstanding               166,667     833,333            
Exercise price of warrants | $ / shares               $ 3.00     $ 3.75            
Intracoastal and Anson [Member] | Related Agents [Member]                                  
Equity [Line Items]                                  
Warrants outstanding                     100,000            
Exercise price of warrants | $ / shares                     $ 5.00            
Intracoastal and Anson [Member] | Additional Warrants [Member]                                  
Equity [Line Items]                                  
Exercise price of warrants | $ / shares           $ 5.35         $ 5.35            
Percentage of additional warrants           25.00%                      
Number of common stock shares that warrants to purchase           215,443         215,443            
Q Interactive​, LLC [Member]                                  
Equity [Line Items]                                  
Stock issued related to merger, shares 2,750,000                                
Q Interactive​, LLC [Member] | Common Stock [Member]                                  
Equity [Line Items]                                  
Stock issued related to merger, shares   2,369,190                              
TBO Merger [Member] | Series A Earn-out Shares [Member]                                  
Equity [Line Items]                                  
Stock issued related to merger, shares     1,800,220                            
TBO Merger [Member] | Common Stock [Member]                                  
Equity [Line Items]                                  
Stock issued related to merger, shares     900,108                            
TBO Merger [Member] | Series A Preferred Stock [Member]                                  
Equity [Line Items]                                  
Preferred stock, par value | $ / shares     $ 0.0001                            
Restricted Stock Units and Restricted Stock [Member]                                  
Equity [Line Items]                                  
Shares issued from vesting                     4,001,808            
Common shares withheld to pay withholding taxes                     192,288            
Number of units, Withheld as treasury stock [1]                     192,288 360,235          
Restricted Stock Units [Member]                                  
Equity [Line Items]                                  
Shares issued from vesting                       1,434,562          
Common shares withheld to pay withholding taxes                       360,235          
Treasury stock sold to investor, shares             200,000         200,000          
Number of units, Withheld as treasury stock                     192,288 360,235          
Restricted Stock Units [Member] | Vendor [Member]                                  
Equity [Line Items]                                  
Issuance of common shares to vendors for services rendered, shares                       14,500          
[1] As discussed in Note 13 above, the increase in treasury stock was due to shares withheld to pay statutory withholding taxes upon the vesting of RSUs during related periods, among which, 200,000 shares of treasury stock were subsequently sold to an investor in 2016. As of December 31, 2017, the cumulative shares withheld as treasury stock were 352,523.