Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Details)

v3.19.2
Stock-Based Compensation - Additional Information (Details)
3 Months Ended 6 Months Ended
Jul. 23, 2019
shares
$ / shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
Jun. 30, 2019
USD ($)
stock_plan
$ / shares
shares
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of equity incentive plans | stock_plan       2  
Options granted maximum exercisable period (up to)       10 years  
Stock options issued (in shares)       95,000  
exercise price (usd per share) | $ / shares       $ 0.44  
2011 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for future awards (in shares)   1,174,875   1,174,875  
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Dividend yield (percent)   0.00% 0.00% 0.00% 0.00%
Restricted shares of common stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to non-vested stock options granted expect to recognize, period (in years)       3 months  
Unrecognized compensation cost | $   $ 13,817   $ 13,817  
Nonemployee | Subsequent events | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options issued (in shares) 100,000        
Number of non-employee directors 5        
Vesting period 12 months        
exercise price (usd per share) | $ / shares $ 0.15        
Employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to non-vested stock options granted | $   $ 423,948   $ 423,948  
Unrecognized compensation cost related to non-vested stock options granted expect to recognize, period (in years)       2 years 10 months 20 days