Quarterly report pursuant to Section 13 or 15(d)

Nature of Business, Basis of Presentation and Going Concern Uncertainty - Additional Information (Detail)

v3.20.2
Nature of Business, Basis of Presentation and Going Concern Uncertainty - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2020
shares
Jun. 30, 2020
USD ($)
shares
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
shares
Nature Of Business And Basis Of Presentation [Line Items]                
Common stock, shares authorized | shares   150,000,000       150,000,000   150,000,000
Accumulated deficit   $ (51,946)       $ (51,946)   $ (45,704)
Net loss   (2,922) $ (3,320) $ (3,624) $ (5,904) (6,242) $ (9,528)  
Cash and cash equivalents   12,111       12,111   $ 16,664
Working capital   $ 10,800       10,800    
Net cash used in operations           $ 6,659 $ 8,730  
Subsequent Event [Member]                
Nature Of Business And Basis Of Presentation [Line Items]                
Reverse stock split ratio 0.05              
Common stock, shares authorized | shares 150,000,000