Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Inputs (Details)

v3.19.1
Fair Value Measurements - Inputs (Details) - $ / shares
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Stock price (in dollars per share) $ 3.5 $ 2.01 $ 0.94
CCE interest rate 2.31%    
Convertible note embedded derivative liability      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Probability of change in control 1.75%    
Stock price (in dollars per share) $ 3.50    
Expected term 1 year 6 months    
Assumed early conversion/exercise price (in dollars per share) $ 2.73    
Warrant liability      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Probability of change in control 1.75%    
Stock price (in dollars per share) $ 3.50    
Expected term 1 year 6 months    
Assumed early conversion/exercise price (in dollars per share) $ 2.73    
Stock price volatility | Convertible note embedded derivative liability      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Measurement input (percent) 60.00%    
Stock price volatility | Warrant liability      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Measurement input (percent) 60.00%    
Risk-free interest rate | Convertible note embedded derivative liability      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Measurement input (percent) 2.31%    
Risk-free interest rate | Warrant liability      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Measurement input (percent) 2.31%