Quarterly report pursuant to Section 13 or 15(d)

Debt - Additional Information (Details)

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Debt - Additional Information (Details) - Umpqua Credit Agreement
9 Months Ended
Sep. 30, 2018
USD ($)
Business
Sep. 27, 2018
USD ($)
Line Of Credit Facility [Line Items]    
Credit facility oustanding amount repayment date Sep. 27, 2020  
Credit facility interest rate description (1) a base rate, which fluctuates daily and is the greater of (a) the prime rate in effect as of any date of determination and (b) the daily LIBOR rate as of such date of determination plus 1.0% per annum, or (2) a LIBOR rate, which can be for a period of 30, 60 or 90 days at the Company’s option and is equal to the published rate in the Wall Street Journal for such 30-, 60- or 90-day period two business days prior to the commencement of such period, in each case plus 2.0% per annum.  
Credit facility covenant description Borrowings under the Umpqua Credit Agreement are secured by substantially all the assets of the Company. Additionally, the terms of the Umpqua Credit Agreement include certain financial covenants and various negative covenants.  
Credit facility borrowings outstanding $ 0  
LIBOR    
Line Of Credit Facility [Line Items]    
Interest rate plus per annum 2.00%  
Period of interest rate option applied on credit facility 30 days  
Period of interest rate option applied on credit facility 60 days  
Period of interest rate option applied on credit facility 90 days  
Number of busniess days priror to commencement of periods on interest rate | Business 2  
Credit facility variable rate LIBOR  
LIBOR | Fluctuating Rate Per Annum    
Line Of Credit Facility [Line Items]    
Interest rate plus per annum 1.00%  
Revolving Facility    
Line Of Credit Facility [Line Items]    
Credit agreement date Sep. 27, 2018  
Credit facility maximum borrowing capacity under loan   $ 10,000,000
Revolving Facility | Maximum    
Line Of Credit Facility [Line Items]    
Increase in credit facility total $ 25,000,000  
Letter of Credit Subfacility    
Line Of Credit Facility [Line Items]    
Credit facility maximum borrowing capacity under loan   $ 3,000,000