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Credit Facilities - Additional Information (Details) - USD ($)
12 Months Ended
Sep. 28, 2016
Dec. 31, 2016
Apr. 20, 2016
Dec. 31, 2015
Line Of Credit Facility [Line Items]        
Payment of debt prepayment fees   $ 200,000    
Cash and cash equivalents   42,007,000   $ 17,256,000
Subordinated Loan And Security Agreement        
Line Of Credit Facility [Line Items]        
Payment of debt prepayment fees $ 200,000      
Repayments of loan agreement   0    
Senior Credit Facility        
Line Of Credit Facility [Line Items]        
Repayment of senior credit facility 10,000,000      
Unamortized debt issuance costs   $ 500,000    
Credit facility, covenant terms   If the Company’s cash and cash equivalents, as defined in the senior credit facility, are below $25.0 million as of the last day of the applicable monthly measuring period, the Company will be required to comply with a financial covenant based on subscription and professional services bookings. This financial covenant is measured both monthly and quarterly, generally on a trailing six month basis.    
Cash and cash equivalents   $ 25,000,000    
Senior Credit Facility | Revolving Credit Facility        
Line Of Credit Facility [Line Items]        
Term loan borrowings   $ 0   $ 0
Credit facility frequency of interest payments   monthly    
Credit facility expiration date   Jun. 16, 2017    
Senior Credit Facility | SVB and ORIX Ventures, LLC | Term Loan Borrowings        
Line Of Credit Facility [Line Items]        
Term loan borrowings     $ 20,000,000  
Senior Credit Facility | Silicon Valley Bank | Revolving Credit Facility        
Line Of Credit Facility [Line Items]        
Maximum borrowings capacity   $ 15,000,000    
Subordinated Debt        
Line Of Credit Facility [Line Items]        
Repayment of subordinated loan $ 10,000,000