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Long-term Debt - Narrative (Details)
1 Months Ended 3 Months Ended
Mar. 31, 2020
USD ($)
shares
Aug. 31, 2019
USD ($)
installment
tranche
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
shares
Mar. 31, 2019
USD ($)
Jul. 24, 2017
shares
Debt Instrument [Line Items]            
Proceeds from borrowings, net of issuance costs       $ 5,000,000 $ 0  
Unamortized debt discount $ 714,000     714,000    
Amortization of debt discount       44,000 $ 35,000  
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 exercisable 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     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     $ 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%        
Number of equal monthly installments payable | installment   34        
Final payment percentage   5.50%        
Term Loans | Silicon Valley Bank | Common Stock Warrant            
Debt Instrument [Line Items]            
Warrants exercisable 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   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]            
Maximum borrowing capacity, 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