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Credit Facility (Details) - Line of credit
 1 Months Ended
Sep. 30, 2018
Nov. 30, 2016
USD ($)
Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Debt instrument term (in years)   3 years
Maximum borrowing capacity   $ 25,000,000.0
Debt covenant, net cash equals or exceeds, amount   50,000,000.0
Debt covenant, net cash falls below, amount   $ 50,000,000.0
Unused capacity commitment fee   0.40%
Minimum adjusted quick ratio under debt compliance   1.50
Amended Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Unused capacity commitment fee 0.30%  
Letter of Credit    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity   $ 25,000,000.0
Prime Rate | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Variable rate basis spread   0.50%
LIBOR | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Variable rate basis spread   2.50%