Annual report pursuant to Section 13 and 15(d)

Common Stock - Stock Warrants - Additional Information (Detail)

v3.19.1
Common Stock - Stock Warrants - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jun. 19, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Exercise price per unit of warrant     $ 4.00
Proceeds from warrants exercise $ 1,324    
Number of warrants exercised   0  
Common stock, shares issued 6,721,117 1,195,675  
Warrants Issued In June 2018 [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Exercise price per unit of warrant $ 4.00    
Proceeds from warrants exercise $ 1,300    
Number of warrants exercised 330,500