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Financing Obligations - Revolving Line of Credit (Details)
Aug. 31, 2017
USD ($)
Apr. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Revolving line of credit   $ 6,000,000 $ 6,000,000
Silicon Valley Bank | Revolving line of credit      
Debt Instrument [Line Items]      
Extended period of line of credit 1 year    
Unrestricted cash or cash equivalents (at least) $ 6,000,000    
Long-term portion of obligations (at least) 1.40    
Loan advances $ 6,000,000    
Loan advances subject to increase $ 12,000,000.0    
Revolving line of credit   $ 6,000,000  
Interest rate   4.63%