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Debt (Details)
1 Months Ended 3 Months Ended
May 23, 2017
USD ($)
Aug. 01, 2016
USD ($)
Apr. 06, 2015
Aug. 28, 2014
USD ($)
Loan
Mar. 31, 2018
USD ($)
Jan. 31, 2018
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2015
USD ($)
Jan. 29, 2015
USD ($)
Loan and Security Agreement [Abstract]                      
Payments for debt issuance costs             $ 90,000 $ 0      
Short term debt         $ 20,900,000   20,900,000   $ 3,075,421    
Future Principal Payments [Abstract]                      
2018 (remaining)         3,069,000   3,069,000        
2019         9,817,000   9,817,000        
2020         7,114,000   7,114,000        
2021         0   0        
Total         $ 20,000,000   $ 20,000,000        
Original Loan Agreement [Member]                      
Loan and Security Agreement [Abstract]                      
Aggregate principal amount of borrowing capacity       $ 10,000,000              
Number of term loans | Loan       3              
Interest rate     9.95% 10.45%              
Adjustment to interest rate     (4.50%) (4.50%)              
Term for making principal and interest payments             30 months        
Additional interest rate charged on due date       1.50% 1.50%            
Payments for debt issuance costs         $ 90,000            
First Term Loan under Original Loan Agreement [Member]                      
Loan and Security Agreement [Abstract]                      
Face amount       $ 3,000,000              
Maturity date             Mar. 01, 2018        
Second Term Loan under Original Loan Agreement [Member]                      
Loan and Security Agreement [Abstract]                      
Face amount                     $ 3,000,000
Maturity date             Mar. 01, 2018        
Third Term Loan under Original Loan Agreement [Member]                      
Loan and Security Agreement [Abstract]                      
Unused borrowing capacity                   $ 4,000,000  
Amended Loan Agreement [Member]                      
Loan and Security Agreement [Abstract]                      
Aggregate principal amount of borrowing capacity   $ 20,000,000                  
Maturity date             Feb. 03, 2020        
Term for making principal and interest payments             24 months        
Additional interest rate charged on due date   4.50%                  
Effective interest rate         9.40%   9.40%        
Period to extend interest-only payments at lender's discretion           6 months          
Additional interest charged on due date   $ 900,000                  
Short term debt         $ 900,000   $ 900,000        
Prepayment charge during first year following initial closing   2.00%                  
Prepayment charge during second year following initial closing   1.00%                  
Prepayment charge after second year following initial closing   0.50%                  
Event of default rate   5.00%                  
Amended Loan Agreement [Member] | Maximum [Member]                      
Loan and Security Agreement [Abstract]                      
Maturity date             Aug. 03, 2020        
First Term Loan under Amended Loan Agreement [Member]                      
Loan and Security Agreement [Abstract]                      
Face amount   $ 15,000,000                  
Second Term Loan under Amended Loan Agreement [Member]                      
Loan and Security Agreement [Abstract]                      
Face amount $ 5,000,000                    
Interest rate 9.15%                    
Adjustment to interest rate (4.50%)