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Debt, Prior Loan Agreement (Details)
$ in Thousands
12 Months Ended
Aug. 04, 2016
USD ($)
Jan. 01, 2016
Installment
Jun. 26, 2015
USD ($)
Feb. 18, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]            
Maximum borrowing capacity         $ 5,000  
Repayment of outstanding debt         0 $ (8,000)
Loss on early retirement of long-term debt         0 (500)
Silicon Valley Bank [Member]            
Debt Instrument [Line Items]            
Maximum borrowing capacity       $ 10,000    
Annual interest rate       7.00%    
Proceeds from term loan used for general corporate and working capital     $ 2,000 $ 6,000    
Consecutive equal monthly installments | Installment   24        
Repayment of outstanding debt $ (5,500)          
Loss on early retirement of long-term debt $ (500)          
Total borrowings outstanding         $ 0 $ 0