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Stock-Based Compensation - Assumptions Used for Determining Fair Value of Stock Options Under Black-Scholes Pricing Model (Detail)
3 Months Ended
Mar. 31, 2022
$ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Expected dividend yield 0.00%
Minimum [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Stock and exercise prices $ 2.32
Discount rate-bond equivalent yield 1.76%
Expected life (in years) 5 years 6 months 18 days
Expected volatility 161.00%
Maximum [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Stock and exercise prices $ 2.39
Discount rate-bond equivalent yield 2.41%
Expected life (in years) 6 years 10 days
Expected volatility 163.00%