Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - shares |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
Property, Plant and Equipment [Line Items] | |||
Short-term investment maturity period | 3 months | ||
Weighted average number of common shares outstanding | 10,538,114 | 9,346,213 | 8,583,795 |
Minimum [Member] | |||
Property, Plant and Equipment [Line Items] | |||
Property and Equipment, estimated useful life | 3 years | ||
Maximum [Member] | |||
Property, Plant and Equipment [Line Items] | |||
Property and Equipment, estimated useful life | 30 years |