Quarterly report pursuant to Section 13 or 15(d)

Revolving Credit Facility (Details)

v3.8.0.1
Revolving Credit Facility (Details)
 3 Months Ended 9 Months Ended
Jun. 02, 2017
USD ($)
agreement
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
agreement
Dec. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Revolving Credit Facility            
Outstanding borrowings   $ 10,966,000   $ 10,966,000   $ 11,533,000
Interest expense   $ 170,000 $ 129,000 489,000 $ 392,000  
Amortization of deferred financing costs       $ 168,000 129,000  
Borrowing rate (as a percent)   6.00%   6.00%   4.90%
Wells Fargo            
Revolving Credit Facility            
Number of credit and security agreements | agreement       2    
Bridge Bank            
Revolving Credit Facility            
Number of secured credit facilities | agreement 2          
Term of credit agreements 2 years          
Maximum borrowings as a percent of cash held 85.00%          
Credit Facility | Wells Fargo            
Revolving Credit Facility            
Maximum borrowing capacity under facility   $ 20,000,000   $ 20,000,000    
Outstanding borrowings     8,700,000   8,700,000 $ 11,500,000
Interest expense     100,000 200,000 400,000  
Amortization of deferred financing costs     $ 43,800 100,000 $ 100,000  
Credit Facility | Bridge Bank            
Revolving Credit Facility            
Maximum borrowing capacity under facility $ 12,000,000          
Outstanding borrowings   11,000,000   11,000,000    
Interest expense   200,000   300,000    
Amortization of deferred financing costs   34,300   100,000    
Restricted cash equivalents for credit facility 5,000,000          
Origination fees $ 200,000          
Amount available for additional borrowing   $ 1,000,000   $ 1,000,000    
Credit Facility | Bridge Bank | Prime Rate            
Revolving Credit Facility            
Variable base rate prime rate          
Interest margin on variable rate 1.50%