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Stockholders' Equity - Restricted Stock Units (Detail Textual) - Restricted Stock Units (RSUs) [Member] - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation arrangement by share-based payment award, equity instrument other than option, nonvested, intrinsic value $ 156,800  
Restricted stock units, nonvested grants in period 160,000 0
Restricted stock or unit expense $ 4,680  
Share-based compensation arrangement by share-based payment award, equity instruments other than options, future compensation expected to vest over weighted average vesting period $ 161,720  
Share-based compensation arrangement by share-based payment award, options, vested and expected to vest, outstanding, weighted average remaining contractual term 1 year