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Common Stock - Summary Of The Restricted Stock Activity (Detail) - Restricted Stock [Member]
6 Months Ended
Jun. 30, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares - Beginning | shares 679,158
Shares - Vested | shares (373,837)
Shares - Cancelled | shares (14,844)
Shares - Ending | shares 290,477
Weighted- Average Purchase Price - Beginning | $ / shares $ 0.21
Weighted- Average Purchase Price - Vested | $ / shares 0.39
Weighted- Average Purchase Price - Cancelled | $ / shares 0.03
Weighted- Average Purchase Price - Ending | $ / shares $ 0.03