Quarterly report pursuant to Section 13 or 15(d)

Nature of Business and Basis of Presentation - Additional Information (Detail)

v3.19.1
Nature of Business and Basis of Presentation - Additional Information (Detail)
$ in Thousands
3 Months Ended
May 23, 2018
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Accounting Policies [Abstract]        
Reverse stock split ratio 0.1      
Accumulated deficit   $ (31,288)   $ (25,381)
Net loss   (5,904) $ (3,022)  
Cash, cash equivalents and short term investments   9,700    
Working capital   $ 6,500