Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Outstanding Warrants Valuation Assumption (Detail)

v3.19.1
Stockholders' Equity - Outstanding Warrants Valuation Assumption (Detail)
Mar. 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 0.024 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) 10 months 24 days 1 year 1 month 6 days
Measurement Input, Expected Dividend Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Warrants and Rights Outstanding, Measurement Input 0.00 0.00
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 0.80 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 5.81 4.04