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Stock-Based Compensation - Additional Information (Detail)
3 Months Ended 9 Months Ended
Jun. 05, 2020
shares
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
Sep. 30, 2020
USD ($)
Plan
shares
Sep. 30, 2019
Dec. 31, 2019
USD ($)
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of equity incentive plans | Plan       2    
Total Shares Outstanding   254,356   254,356   273,406
Unrecognized share-based compensation expense, weighted-average recognition period       2 years 6 months 3 days    
Minimum [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Estimated forfeitures rate   0.00% 0.00% 0.00% 0.00%  
Maximum [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Estimated forfeitures rate   8.00% 8.00% 8.00% 8.00%  
Stock Options [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Intrinsic value of options outstanding | $   $ 0   $ 0   $ 0
Intrinsic value of options exercisable | $   0   0   0
Intrinsic value of options vested and unvested expected to vest | $   0   0   $ 0
RSUs [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Intrinsic value shares, RSUs outstanding | $   100   100    
Intrinsic value amount, RSUs unvested and vested expected to vest | $   $ 100   $ 100    
RSUs outstanding   36   36   36
Stock Options and RSUs [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Unrecognized share-based compensation expense, stock options | $   $ 1,425,133   $ 1,425,133    
2013 Equity Incentive Plan [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Total stock options and RSUs authorized   12,421   12,421    
2013 Equity Incentive Plan [Member] | Non-inducement Shares [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Increase in number of shares of common stock authorized for issuance 730,000          
Total stock options and RSUs authorized   1,036,409   1,036,409    
Stock options and RSUs issued       258,625    
Total Shares Outstanding   254,356   254,356    
Common stock, shares authorized   777,784   777,784    
2013 Equity Incentive Plan [Member] | Inducement shares [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Total stock options and RSUs authorized   11,836   11,836    
Stock options and RSUs issued       11,836    
Total Shares Outstanding   2,412   2,412    
Common stock, shares authorized   9,340   9,340