Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Nature of Business and Basis of Presentation - Additional Information (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
May 23, 2018
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Accounting Policies [Abstract]                
Reverse stock split ratio 0.1              
Accumulated deficit   $ (38,837)       $ (38,837)   $ (25,381)
Net loss   (3,624) $ (5,904) $ (2,788) $ (3,022) (9,528) $ (5,810)  
Cash and cash equivalents   10,446       10,446   $ 9,515
Working capital   $ 7,800       $ 7,800