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Convertible Notes - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 18, 2018
Feb. 17, 2018
Aug. 31, 2019
Feb. 28, 2019
Oct. 31, 2018
Mar. 31, 2016
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Debt Instrument [Line Items]                    
Stated interest rate             8.00%   8.00%  
Interest expense             $ 54,000 $ 104,000 $ 164,000 $ 531,000
Senior Secured Convertible Notes due August 15 2018                    
Debt Instrument [Line Items]                    
Stated interest rate         8.00% 10.00%        
Principal amount           $ 8,000,000        
Redemption purchase price 100.00% 120.00%                
Minimum ownership percentage triggering event for redemption of notes           40.00%        
Maximum amount of indebtedness subordinated by security interest and cash payment rights under debt instruments           $ 5,000,000        
Payment on principle amount of note         $ 7,400,000          
Senior Secured Convertible Notes due August 15 2018 | Contractual obligations and other termination costs                    
Debt Instrument [Line Items]                    
Debt issuance costs           $ 100,000        
Interest expense             $ 0 $ 6,000 $ 0 $ 30,000
Senior Secured Convertible Notes due August 15 2018 | Maximum                    
Debt Instrument [Line Items]                    
Period for outstanding balance of accounts receivable has not recorded an allowance for doubtful accounts           90 days        
Senior Secured Convertible Notes due August 15 2018 | Minimum                    
Debt Instrument [Line Items]                    
Percentage of beneficial ownership if effective upon conversion date of debt instrument           19.90%        
Interest Note                    
Debt Instrument [Line Items]                    
Conversion price             $ 11.434   $ 11.434  
Semi-annual interest payments     $ 109,000 $ 78,000            
Number of shares issuable if notes converted to shares of common stock                 244,884  
Beneficial ownership ceiling             9.90%   9.90%  
Senior Secured Convertible Notes due August 15, 2023                    
Debt Instrument [Line Items]                    
Conversion price         $ 11.434 $ 170.00        
Outstanding Notes payable             $ 2,900,000   $ 2,900,000