Quarterly report pursuant to Section 13 or 15(d)

Revolving Credit Facility (Details)

v3.10.0.1
Revolving Credit Facility (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 01, 2018
May 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
agreement
Dec. 31, 2017
USD ($)
Mar. 31, 2018
USD ($)
Revolving Credit Facility                
Interest expense       $ 202,000 $ 170,000 $ 506,000 $ 489,000  
Amortization of deferred financing costs           $ 132,000 168,000  
Borrowing rate (as a percent)       6.50%   6.50%    
Outstanding borrowings       $ 10,736,000   $ 10,736,000   $ 8,527,000
Wells Fargo                
Revolving Credit Facility                
Number of credit and security agreements | agreement           2    
Bridge Bank                
Revolving Credit Facility                
Maximum borrowing capacity under facility       $ 15,000,000   $ 15,000,000    
Maximum borrowings as a percent of cash held       85.00%   85.00%    
Credit Facility | Wells Fargo                
Revolving Credit Facility                
Maximum borrowing capacity under facility       $ 20,000,000   $ 20,000,000    
Interest expense             200,000  
Amortization of deferred financing costs             100,000  
Credit Facility | Bridge Bank                
Revolving Credit Facility                
Maximum borrowing capacity under facility   $ 12,000,000   15,000,000   15,000,000    
Interest expense       200,000 200,000 500,000 300,000  
Amortization of deferred financing costs       46,900 $ 34,300 100,000 $ 100,000  
Variable base rate prime rate prime rate            
Outstanding borrowings       10,700,000   10,700,000    
Restricted cash equivalents for credit facility       6,000,000   6,000,000    
Origination fees       400,000   400,000    
Amount available for additional borrowing       $ 4,300,000   $ 4,300,000    
Facility fee percentage   0.625%            
Cash collateral percentage   42.00%            
Credit Facility | Bridge Bank | Prime Rate                
Revolving Credit Facility                
Variable base rate     prime rate          
Interest margin on variable rate   1.50% 1.00%          
Letter Agreement | Bridge Bank                
Revolving Credit Facility                
Maximum borrowing capacity under facility     $ 15,000,000          
Restricted cash     $ 6,000,000          
Facility fee percentage     0.50%          
Cash collateral percentage     40.00%          
Fee for early termination     $ 0          
Letter Agreement | Bridge Bank | Prime Rate                
Revolving Credit Facility                
Interest margin on variable rate     1.00%          
Domestic Facility | Bridge Bank                
Revolving Credit Facility                
Maximum line of credit advances as a percentage of unrestricted cash and cash collateral       85.00%   85.00%