Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Warrant Liabilities And Convertible Notes At Fair Value (Detail)

v3.10.0.1
Fair Value Measurements - Warrant Liabilities And Convertible Notes At Fair Value (Detail) - $ / shares
 5 Months Ended 9 Months Ended
Mar. 15, 2018
Sep. 30, 2018
Jun. 30, 2018
Warrants Issuable [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value Measurements Expected Risk Free Interest Rate 2.42%    
Fair Value Measurements Expected Dividend Rate 0.00%    
Fair Value Measurements Expected Term 3 years 5 months 26 days    
Fair Value Measurements Expected Volatility Rate 59.23%    
National Warrant Liabilities [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value Measurements Expected Dividend Rate     0.00%
National Warrant Liabilities [Member] | Minimum [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value Measurements Expected Risk Free Interest Rate     1.93%
Fair Value Measurements Expected Term     1 month 20 days
Fair Value Measurements Exercise Price     $ 0.01
Remaining volatility     49.70%
National Warrant Liabilities [Member] | Maximum [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value Measurements Expected Risk Free Interest Rate     2.73%
Fair Value Measurements Expected Term     4 years 9 months 29 days
Fair Value Measurements Exercise Price     $ 10.00
Remaining volatility     381.00%
Caelum Convertible Note [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value Measurements Expected Volatility Rate   67.00%  
Caelum Convertible Note [Member] | Minimum [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value Measurements Expected Risk Free Interest Rate   2.195%  
Fair Value Measurements Expected Term   3 months 14 days  
Caelum Convertible Note [Member] | Maximum [Member]      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Fair Value Measurements Expected Risk Free Interest Rate   2.56%  
Fair Value Measurements Expected Term   11 months 12 days