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Long-term Debt - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2020
USD ($)
shares
Aug. 31, 2019
USD ($)
installment
tranche
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jul. 31, 2020
$ / shares
shares
Jun. 30, 2020
USD ($)
Jul. 24, 2017
shares
Debt Instrument [Line Items]                    
Proceeds from borrowings, net of issuance costs           $ 5,000,000 $ 1,977,000      
Amortization of debt discount       $ 67,000 $ 32,000 192,000 $ 99,000      
Unamortized debt discount       $ 565,000   $ 565,000        
Common Stock Warrant                    
Debt Instrument [Line Items]                    
Warrants issued for shares of common stock (in shares) | shares               1,779,096    
Warrants issued, exercise price (in dollars per share) | $ / shares               $ 12.74    
Silicon Valley Bank | Original Agreement                    
Debt Instrument [Line Items]                    
Proceeds from borrowings, net of issuance costs     $ 5,000,000.0              
Repayments of debt   $ 3,000,000.0                
Prepayment fee (equal to)   75,000                
Silicon Valley Bank | Original Agreement | Common Stock Warrant                    
Debt Instrument [Line Items]                    
Warrants issued for shares of common stock (in shares) | shares                   7,069
Warrants issued, exercise price (in dollars per share) | $ / shares     $ 12.38              
Silicon Valley Bank | Original Agreement | Prime Rate                    
Debt Instrument [Line Items]                    
Debt instrument variable interest rate     1.75%              
Term Loans                    
Debt Instrument [Line Items]                    
Debt instrument, total discount recorded   812,000                
Term Loans | Term Loans, Tranche One | Common Stock Warrant                    
Debt Instrument [Line Items]                    
Fair value of warrant   $ 60,000                
Term Loans | Term Loans, Tranche Two | Common Stock Warrant                    
Debt Instrument [Line Items]                    
Fair value of warrant                 $ 60,000  
Term Loans | Silicon Valley Bank                    
Debt Instrument [Line Items]                    
Debt instrument variable interest rate   0.25%                
Maximum borrowing capacity, amount   $ 15,000,000.0                
Number of tranches (up to) | tranche   3                
Percentage of default interest rate   4.00%                
New capital milestone for continuation of interest only payment period   $ 40,000,000.0                
Number of equal monthly installments payable | installment   25                
Final payment percentage   5.50%                
Term Loans | Silicon Valley Bank | Common Stock Warrant                    
Debt Instrument [Line Items]                    
Warrants issued for shares of common stock (in shares) | shares   52,083                
Warrants issued, exercise price (in dollars per share) | $ / shares   $ 4.32                
Number of shares exercisable (in shares) | shares 17,361 17,361                
Term Loans | Silicon Valley Bank | Base Rate                    
Debt Instrument [Line Items]                    
Debt instrument, interest rate floor   5.75%                
Term Loans | Silicon Valley Bank | Term Loans, Tranche One                    
Debt Instrument [Line Items]                    
Proceeds from borrowings, net of issuance costs   $ 5,000,000.0                
Term Loans | Silicon Valley Bank | Term Loans, Tranche Two                    
Debt Instrument [Line Items]                    
Proceeds from borrowings, net of issuance costs $ 5,000,000.0                  
Term Loans | Silicon Valley Bank | Term Loans, Tranche Three                    
Debt Instrument [Line Items]                    
Unused borrowing capacity, expired amount   $ 5,000,000.0                
Debt Instrument, Redemption, Period One | Term Loans | Silicon Valley Bank                    
Debt Instrument [Line Items]                    
Redemption price, percentage   2.00%                
Debt Instrument, Redemption, Period Two | Term Loans | Silicon Valley Bank                    
Debt Instrument [Line Items]                    
Redemption price, percentage   1.00%                
Debt Instrument, Redemption, Period Three | Term Loans | Silicon Valley Bank                    
Debt Instrument [Line Items]                    
Redemption price, percentage   0.00%                
Maximum                    
Debt Instrument [Line Items]                    
Percentage change in loan in a non-troubled debt restructuring (less than)   0.10