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Line Of Credit (Details) - The Credit Agreement - Line of Credit
12 Months Ended
Dec. 31, 2019
USD ($)
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity $ 25,000,000.0
Debt Instrument, Unused Borrowing Capacity Fee Rate 0.10%
Long-term Line of Credit, Noncurrent $ 0
London Interbank Offered Rate (LIBOR)  
Line of Credit Facility [Line Items]  
Debt Instrument, Basis Spread on Variable Rate 1.00%