Annual report pursuant to Section 13 and 15(d)

Marketable Securities and Fair Value Measurements - Summary of Fair Value of Warrants (Detail)

v3.20.1
Marketable Securities and Fair Value Measurements - Summary of Fair Value of Warrants (Detail) - Basis of Fair Value Measurements, Level 3
Dec. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Measurement Input, Risk Free Interest Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Warrants and Rights Outstanding, Measurement Input 0.016 0.026
Measurement Input, Expected Term    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Expected life (in years) 1 month 6 days 1 year 1 month 6 days
Measurement Input, Price Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Warrants and Rights Outstanding, Measurement Input 0.86 0.77
Measurement Input, Share Price    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Warrants and Rights Outstanding, Measurement Input 13.99 4.04