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Common stock, treasury stock and warrants - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 09, 2018
Apr. 09, 2018
Jan. 10, 2018
Nov. 30, 2017
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Equity [Line Items]                
Common stock, shares issued (in shares)         76,516,415 76,516,415   61,631,573
Treasury stock, shares (in shares)         1,225,085 1,225,085   352,523
Proceeds from issuance of shares, net of issuance costs           $ 13,392 $ 0  
Treasury stock, value         $ 3,253 $ 3,253   $ 1,274
Warrants outstanding         2,623,776 2,623,776   1,273,776
Common stock, par value (in usd per share)         $ 0.0005 $ 0.0005   $ 0.0005
Increase to additional paid-in-capital           $ 200    
Minimum                
Equity [Line Items]                
Exercise price of warrants (in usd per share)         3.75 $ 3.75    
Maximum                
Equity [Line Items]                
Exercise price of warrants (in usd per share)         $ 8 $ 8    
Accelerated Vesting of RSUs                
Equity [Line Items]                
Treasury stock, repurchased   729,167            
Treasury stock, repurchased value   $ 1,581            
Warrant                
Equity [Line Items]                
Issuance of common shares upon exercise of warrants, shares       300,000        
Additional Paid-in Capital                
Equity [Line Items]                
Increase to additional paid-in-capital         $ 0 $ 200    
Registered Direct Offering | Common Stock                
Equity [Line Items]                
Issuance of shares, net of offering costs, shares     2,700,000          
Common stock purchase price per share     $ 5.00          
Proceeds from issuance of shares, net of issuance costs     $ 13,392          
Issuance costs     $ 108          
Registered Direct Offering | Warrant                
Equity [Line Items]                
Issuance of shares, net of offering costs, shares     1,350,000          
Exercise price of warrants (in usd per share)     $ 6.00          
Warrants exercisable period     2 years          
Restricted Stock Units                
Equity [Line Items]                
Shares issued from vesting           12,184,842    
Common shares withheld to pay withholding taxes           872,562    
Whitehorse Warrants                
Equity [Line Items]                
Minimum share price to transfer common stock underlying warrants (in usd per share) $ 3.8334     $ 4.5        
Whitehorse Warrants | H.I.G. Whitehorse SMA ABF, L.P.                
Equity [Line Items]                
Exercise price of warrants (in usd per share) $ 3.00              
Warrant rights exercisable 46,667              
Common stock, par value (in usd per share) $ 0.0005              
Whitehorse Warrants | H.I.G. Whitehorse SMA Holdings I, LLC                
Equity [Line Items]                
Exercise price of warrants (in usd per share) $ 3.00              
Warrant rights exercisable 66,666              
Whitehorse Warrants | Whitehorse Finance, Inc.                
Equity [Line Items]                
Exercise price of warrants (in usd per share) $ 3.00              
Warrant rights exercisable 186,667              
Put Rights | Whitehorse Warrants                
Equity [Line Items]                
Exercise price of warrants (in usd per share) $ 3.8334              
Red Violet, Inc. | Spin-off | Warrant                
Equity [Line Items]                
Issuance of shares, net of offering costs, shares 40,000              
Sale of shares in private placement $ 200