Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Restricted Stock Unit Awards - Additional Information (Detail)

v3.19.2
Common Stock - Restricted Stock Unit Awards - Additional Information (Detail) - Restricted Stock Unit [Member] - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Award vesting period     4 years  
Stock based compensation expense $ 37,000 $ 37,000 $ 37,000 $ 37,000
Total unrecognized compensation expense related to the Company's restricted stock unit awards $ 300,000   $ 300,000  
Weighted-average period, restricted stock awards     2 years 1 month 2 days