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Debt - Summary of Carrying Value of Debt (Details)
1 Months Ended 3 Months Ended 6 Months Ended 8 Months Ended
Oct. 31, 2018
Sep. 30, 2018
USD ($)
installment
Dec. 31, 2018
USD ($)
Jun. 30, 2019
USD ($)
installment
Aug. 31, 2018
Debt Instrument [Line Items]          
Total debt     $ 24,000,000 $ 47,107,000  
Less: unamortized debt discount issuance costs     (90,000) (64,000)  
Balance     23,910,000 47,043,000  
Debt, current     (5,671,000) (32,574,000)  
Debt, noncurrent     $ 18,239,000 $ 14,469,000  
Weighted-average interest rate     6.89% 5.96%  
First Term Loan          
Debt Instrument [Line Items]          
Total debt     $ 15,000,000 $ 13,750,000  
Interest only payments term       18 months  
Number of equal monthly installments of principal and interest | installment       36  
First Term Loan | Prime Rate          
Debt Instrument [Line Items]          
Debt, variable rate       0.25%  
Second Term Loan          
Debt Instrument [Line Items]          
Total debt     $ 9,000,000 $ 8,357,000  
Interest only payments term       11 months  
Number of equal monthly installments of principal and interest | installment   42   47  
EBITDA, trailing period   6 months      
EBITDA   $ 1,000,000.0      
Second Term Loan | Prime Rate          
Debt Instrument [Line Items]          
Debt, variable rate 0.25% 5.25% 0.25%   5.25%
Line of Credit          
Debt Instrument [Line Items]          
Total debt     $ 0 $ 25,000,000