Quarterly report pursuant to Section 13 or 15(d)

Revolving Credit Facility (Details)

v3.6.0.2
Revolving Credit Facility (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2017
agreement
Sep. 01, 2017
agreement
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
agreement
Dec. 31, 2015
USD ($)
Mar. 31, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 10, 2015
USD ($)
Revolving Credit Facility                  
Restricted cash     $ 5,009,000   $ 5,009,000   $ 5,002,000    
Outstanding borrowings     8,665,000   8,665,000   $ 9,459,000    
Interest expense     129,000 $ 159,000 392,000 $ 506,000      
Amortization of deferred financing costs         $ 129,000 129,000      
Credit Facility                  
Revolving Credit Facility                  
Number of credit and security agreements | agreement         2        
Maximum borrowing capacity under facility     20,000,000   $ 20,000,000     $ 20,000,000  
Previous maximum line of credit     15,000,000   15,000,000        
Minimum cash balance     $ 7,400,000   $ 7,400,000        
Restricted cash                 $ 5,000,000
Variable base rate         Three month LIBOR        
Borrowing rate (as a percent)     4.70%   4.70%   4.40%    
Annual unused line fee (as a percent)         0.25%        
Interest rate with respect to letters of credit (as a percent)         1.50%        
Outstanding borrowings     $ 8,700,000   $ 8,700,000   $ 9,500,000    
Additional borrowing capacity under facility     9,700,000   9,700,000        
Interest expense     100,000 200,000 400,000 500,000      
Amortization of deferred financing costs     43,800 $ 43,800 100,000 $ 100,000      
Credit Facility | Forecast                  
Revolving Credit Facility                  
Number of credit and security agreements set to expire | agreement 1 1              
Credit Facility | Minimum                  
Revolving Credit Facility                  
Interest floor amount         66,000        
Non-revolving capital expenditure line of credit                  
Revolving Credit Facility                  
Maximum borrowing capacity under facility     $ 500,000   $ 500,000