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Debt - Summary of Carrying Value of Debt (Details)
1 Months Ended 8 Months Ended 12 Months Ended
Oct. 31, 2018
Sep. 30, 2018
USD ($)
installment
Aug. 31, 2018
Dec. 31, 2018
USD ($)
installment
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]          
Total debt       $ 24,000,000 $ 34,000,000
Less: Unamortized debt discount issuance costs       (90,000) (167,000)
Balance       23,910,000 33,833,000
Debt, current       (5,671,000) (10,342,000)
Debt, noncurrent       $ 18,239,000 $ 23,491,000
Weighted-average interest rate       6.89% 5.93%
First term loan—18 months of interest-only payments ending in March 2019 followed by 36 equal monthly installments of principal plus interest, maturing March 2022; interest at Prime plus 0.25% per annum          
Debt Instrument [Line Items]          
Total debt       $ 15,000,000 $ 15,000,000
Interest only payments term       18 months  
Number of equal monthly installments of principal and interest | installment       36  
First term loan—18 months of interest-only payments ending in March 2019 followed by 36 equal monthly installments of principal plus interest, maturing March 2022; interest at Prime plus 0.25% per annum | Prime Rate          
Debt Instrument [Line Items]          
Debt, variable rate       0.25%  
Second term loan—11 months of interest-only payments ending in October 2018 followed by 47 equal monthly installments of principal plus interest, maturing September 2022. As of September 30, 2018, the Company achieved trailing six-month EBITDA of at least $1.0 million; as a result, the interest-only repayment period extended to March 2019, followed by 42 equal monthly installments of principal plus interest; bears interest at Prime plus 5.25% per annum. As a result of the Company's IPO, the interest rate          
Debt Instrument [Line Items]          
Total debt       $ 9,000,000 9,000,000
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—11 months of interest-only payments ending in October 2018 followed by 47 equal monthly installments of principal plus interest, maturing September 2022. As of September 30, 2018, the Company achieved trailing six-month EBITDA of at least $1.0 million; as a result, the interest-only repayment period extended to March 2019, followed by 42 equal monthly installments of principal plus interest; bears interest at Prime plus 5.25% per annum. As a result of the Company's IPO, the interest rate | Prime Rate          
Debt Instrument [Line Items]          
Debt, variable rate 0.25% 5.25% 5.25%    
Line of credit—interest at Prime with accrued interest due monthly; matures September 2020          
Debt Instrument [Line Items]          
Total debt       $ 0 $ 10,000,000