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Notes Payable - Additional Information (Details)
$ / shares in Units, $ in Thousands
6 Months Ended
May 18, 2018
USD ($)
Lender
$ / shares
shares
Oct. 30, 2015
USD ($)
Lender
Jun. 30, 2019
Jun. 30, 2018
USD ($)
Debt Instrument [Line Items]        
Proceeds from term loans       $ 8,631
Prior Agreement        
Debt Instrument [Line Items]        
Number of Lenders | Lender   2    
Loans   $ 18,000    
Debt instrument, frequency of periodic payment     due in monthly principal and interest payments, with final maturity of the Initial Loans in May 2019.  
Debt instrument maturity   May 31, 2019    
Debt instrument, final payment fee, percentage   7.95%    
Loan Agreement | Term Loans        
Debt Instrument [Line Items]        
Number of Lenders | Lender 2      
Loans $ 26,500      
Debt instrument maturity Dec. 01, 2022      
Debt instrument, final payment fee, percentage 7.95%      
Proceeds from term loans $ 8,600      
Number of equal monthly payments of principal and interest 36 months      
Debt instrument payment terms     the Company will have interest-only payments through January 1, 2020, followed by 36 equal monthly payments of principal and interest  
Debt instrument, interest rate terms     The Term Loans bear interest at a floating per annum rate equal to the greater of (i) 8.50% and (ii) the sum of (a) the prime rate reported in the Wall Street Journal on the last business day of the month that immediately proceeds the month in which the interest will accrue, plus (b) 3.75%.  
Period of prior written notice to lender 10 days      
Warrants to purchase shares of common stock | shares 56,578      
Warrant to purchase common stock, exercise price | $ / shares $ 9.35      
Fair value of warrants at the date of issuance $ 500      
Deferred debt issuance cost $ 100      
Debt instrument effective interest rate 10.70%      
Loan Agreement | Term Loans | Expected Term | Significant Unobservable Inputs (Level 3)        
Debt Instrument [Line Items]        
Expected term in years 10 years      
Loan Agreement | Term Loans | Volatility | Significant Unobservable Inputs (Level 3)        
Debt Instrument [Line Items]        
Warrant rate 0.856      
Loan Agreement | Term Loans | Risk Free | Significant Unobservable Inputs (Level 3)        
Debt Instrument [Line Items]        
Warrant rate 0.031      
Loan Agreement | Term Loans | Expected Dividend | Significant Unobservable Inputs (Level 3)        
Debt Instrument [Line Items]        
Warrant rate 0.00      
Loan Agreement | Term Loans | On or Before Second Anniversary        
Debt Instrument [Line Items]        
Percentage of prepayment fee on principal amount 2.00%      
Loan Agreement | Term Loans | Thereafter but Prior to Maturity Date        
Debt Instrument [Line Items]        
Percentage of prepayment fee on principal amount 1.00%      
Loan Agreement | Term Loans | Prime Rate        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate 3.75%      
Loan Agreement | Term Loans | Minimum        
Debt Instrument [Line Items]        
Floating rate of interest 8.50%