Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation - Deferred Stock Units - Additional Information (Detail)

v3.10.0.1
Stock Based Compensation - Deferred Stock Units - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jan. 04, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Deferred Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated share-based compensation expense   $ 0 $ 0 $ 0 $ 1,362
Mr. Gaulding [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock issued during period, value, share-based compensation, net of forfeitures $ 75,000        
Mr. Gaulding [Member] | Stipends [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock issued during period, value, share-based compensation, net of forfeitures $ 50,000        
Non-Employee Equity Compensation Plan 2014 [Member] | Mr. Gaulding [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period 14,953        
Stock issued during period, value, share-based compensation, net of forfeitures $ 125,000