Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.10.0.1
Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2018
Nov. 30, 2017
May 31, 2017
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Class of Stock [Line Items]                
Net proceeds from stock issuance         $ 32,782 $ 32,580    
Warrants outstanding       1,297,151 1,297,151   1,524,573  
Warrants canceled 247,422              
Series A Redeemable Convertible Preferred Stock [Member]                
Class of Stock [Line Items]                
Shares converted to common stock         2,922,978      
Series B Redeemable Convertible Preferred Stock [Member]                
Class of Stock [Line Items]                
Shares converted to common stock         2,309,135      
Follow-on Offering [Member]                
Class of Stock [Line Items]                
Common stock shares issued 1,955,000 1,121,250            
Share price $ 18.00 $ 23.00            
Net proceeds from stock issuance $ 32,780 $ 23,789            
Stock issuance costs $ 2,300 $ 2,000            
Initial Public Offering [Member]                
Class of Stock [Line Items]                
Common stock shares issued     2,500,000          
Share price     $ 15.00         $ 15.00
Net proceeds from stock issuance     $ 32,600          
Stock issuance costs     $ 4,900          
Initial Public Offering [Member] | Acacia [Member]                
Class of Stock [Line Items]                
Common stock shares issued     2,150,335          
Net proceeds from stock issuance     $ 29,263          
Initial Public Offering [Member] | Acacia [Member] | Primary Warrant [Member]                
Class of Stock [Line Items]                
Issuance of stock due to warrants exercise     154,311          
Warrants exercise price per share     $ 13.6088          
Initial Public Offering [Member] | Acacia [Member] | Line of Credit [Member]                
Class of Stock [Line Items]                
Debt instrument outstanding balance     $ 8,000          
Debt instrument converted to common stock     590,717          
Conversion price per share     $ 13.6088          
Initial Public Offering [Member] | Acacia [Member] | Convertible Notes Payable [Member]                
Class of Stock [Line Items]                
Debt instrument outstanding balance     $ 20,000          
Debt instrument converted to common stock     1,523,746          
Conversion price per share     $ 13.6088          
Common Stock [Member]                
Class of Stock [Line Items]                
Common stock issued for acquisitions, shares         941,548      
Common stock shares issued         1,955,000      
Performance Bridge, Wazee Digital and Machine Box [Member] | Common Stock [Member]                
Class of Stock [Line Items]                
Common stock issued for acquisitions, shares       941,548