Quarterly report pursuant to Section 13 or 15(d)

Organization and Nature of Operations - Additional Information (Details)

v3.19.1
Organization and Nature of Operations - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Oct. 01, 2018
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Jul. 14, 2018
Jul. 13, 2018
Subsidiary Sale Of Stock [Line Items]            
Common stock, par value     $ 0.0001 $ 0.0001 $ 0.0001  
Common stock, shares authorized     300,000,000 300,000,000 25,000,000 10,000,000
Proceeds from issuance of common stock   $ 1,401        
Preferred stock, par value     $ 0.0001 $ 0.0001    
Preferred stock, shares authorized     10,000,000 10,000,000    
IPO [Member]            
Subsidiary Sale Of Stock [Line Items]            
Common stock issued, shares 4,485,000          
Common stock, offering price per share $ 17.00          
Gross proceeds from issuance of IPO $ 76,200          
Proceeds from issuance of common stock 67,300          
Underwriting discount 5,300          
Offering costs $ 3,600          
Over-Allotment Option [Member]            
Subsidiary Sale Of Stock [Line Items]            
Common stock issued, shares 585,000