Annual report pursuant to Section 13 and 15(d)

Intangibles - Additional Information (Detail)

v3.20.4
Intangibles - Additional Information (Detail) - USD ($)
12 Months Ended
May 18, 2015
Dec. 31, 2020
Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]      
Intangible assets, Fair Value $ 3,100,000    
Intangible assets, Useful life 14 years    
License agreement amortization expense   $ 200,000 $ 200,000
Impairment of intangible assets   $ 0