XML 40 R30.htm IDEA: XBRL DOCUMENT v3.21.1
Fair Value Measurements and Marketable Securities - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Fair Value Disclosures [Abstract]    
Total cash $ 3,400,000 $ 2,700,000
Fair value assets level 1 to level 2 transfers 0  
Fair value assets level 2 to level 1 transfers 0  
Fair value liabilities level 1 to level 2 transfers 0  
Fair value liabilities level 2 to level 1 transfers 0  
Transfer of financial asset into level 3 of fair value 0  
Transfer of financial liabilities into level 3 of fair value $ 0