Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Stock Options - Additional Information (Detail)

v3.21.2
Common Stock - Stock Options - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common shares reserved for options currently outstanding 477,090   477,090   227,442
Unrecognized compensation expense related to stock options granted $ 3.9   $ 3.9    
Anti-dilutive securities excluded from earning per share computation 1,775,401 1,632,370 1,775,401 1,632,370  
Warrant [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Anti-dilutive securities excluded from earning per share computation 1,244,830   1,244,830    
Stock Options [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Anti-dilutive securities excluded from earning per share computation 477,090   477,090    
Restricted Stock Unit [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Anti-dilutive securities excluded from earning per share computation 53,481   53,481    
Stock Options [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Weighted-average period, restricted stock awards     2 years 10 months 9 days    
Stock Options [Member] | Employees and Consultants [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     4 years    
Stock Options [Member] | Minimum [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award expiration period     7 years    
Stock Options [Member] | Minimum [Member] | Board of Directors [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     1 year    
Stock Options [Member] | Maximum [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award expiration period     10 years    
Stock Options [Member] | Maximum [Member] | Board of Directors [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     3 years    
Restricted Stock Unit [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Restricted shares reserved for issuance under incentive plan 53,250   53,250    
Award vesting period     4 years    
Common shares reserved for awards currently outstanding 53,481   53,481   231
Weighted-average period, restricted stock awards     1 year 11 months 15 days    
2018 Equity Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common shares reserved for issuance under incentive plan 4,145   4,145    
Award expiration period     10 years    
2018 Equity Incentive Plan [Member] | Minimum [Member] | Employees and Consultants [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     3 years    
2018 Equity Incentive Plan [Member] | Minimum [Member] | Board of Directors [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     1 year    
2018 Equity Incentive Plan [Member] | Maximum [Member] | Employees and Consultants [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     4 years    
2018 Equity Incentive Plan [Member] | Maximum [Member] | Board of Directors [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     3 years    
2018 Equity Incentive Plan [Member] | Stock Options [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common shares reserved for issuance under incentive plan 521,100   521,100    
Common shares reserved for options currently outstanding 463,705   463,705    
2017 Equity Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award expiration period     10 years    
2017 Equity Incentive Plan [Member] | Minimum [Member] | Employees and Consultants [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     3 years    
2017 Equity Incentive Plan [Member] | Minimum [Member] | Board of Directors [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     1 year    
2017 Equity Incentive Plan [Member] | Maximum [Member] | Employees and Consultants [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     4 years    
2017 Equity Incentive Plan [Member] | Maximum [Member] | Board of Directors [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     3 years    
2017 Equity Incentive Plan [Member] | Stock Options [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common shares reserved for issuance under incentive plan 13,156   13,156    
2010 Performance Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award expiration period     10 years    
2010 Performance Incentive Plan [Member] | Minimum [Member] | Employees and Consultants [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     3 years    
2010 Performance Incentive Plan [Member] | Minimum [Member] | Board of Directors [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     1 year    
2010 Performance Incentive Plan [Member] | Maximum [Member] | Employees and Consultants [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     4 years    
2010 Performance Incentive Plan [Member] | Maximum [Member] | Board of Directors [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     3 years    
2010 Performance Incentive Plan [Member] | Stock Options [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common shares reserved for issuance under incentive plan 460   460    
Common shares reserved for options currently outstanding 229   229    
2010 Performance Incentive Plan [Member] | Restricted Stock Unit [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common shares reserved for awards currently outstanding 231   231