Quarterly report pursuant to Section 13 or 15(d)

Debt - Convertible Notes (Details)

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Debt - Convertible Notes (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2016
Debt Instrument [Line Items]                
Repayments of debt $ 11,000,000              
Loss on extinguishment of debt   $ 0 $ 10,000 $ 0 $ 25,000 $ 431,000    
Convertible notes                
Debt Instrument [Line Items]                
Debt face amount $ 16,000,000              
Interest rate 8.75%              
Gross amount $ 11,084,000              
Original discount 4,916,000              
Issuance costs $ 1,700,000             $ 212,000
Purchase price of principal 92.75%              
Warrants issued (in shares) 250,000 4,105,600   4,105,600        
Right to receive cash 2.50%              
Convertible debt conversion price (in dollars per share) $ 1.364         $ 1.364 $ 1.364  
Warrant to purchase (in shares)   256,600.00   256,600.00        
Warrant exercise price (in dollars per share) $ 1.364              
Proceeds from debt $ 14,316,000              
Notes converted           $ 5,700,000 $ 10,300,000  
Write off of debt discount             2,591,000  
Write off of deferred debt issuance cost           1,360,000 1,019,000  
Extinguishment of debt           $ 4,340,000 $ 6,690,000  
Conversion of stock, shares issued           4,446,265 8,624,445  
Repayments of debt             $ 247,000  
Adjustments to additional paid in capital           $ 10,582,000 14,238,000  
Loss on extinguishment of debt             $ 1,785,000  
Convertible notes | Convertible note embedded derivative liability                
Debt Instrument [Line Items]                
Warrant liability 3,693,000              
Convertible notes | Warrant liability                
Debt Instrument [Line Items]                
Warrant liability $ 1,223,000