Quarterly report pursuant to Section 13 or 15(d)

Subsequent Event - Additional Information (Detail)

v3.8.0.1
Subsequent Event - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
Apr. 06, 2018
Mar. 31, 2018
Dec. 31, 2017
Subsequent Event [Line Items]      
Common stock issued   5,186,635 4,928,335
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Common stock issued 900,000    
Sale of stock, price per share $ 2.00    
Proceeds from issuance of common stock $ 1,800    
Warrant exercise price $ 2.00    
Warrant exercisable period 6 months    
Warrant expiration period 5 years