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Summary of Significant Accounting Policies - Accounts Receivable and Concentration of Credit Risk (Details Textual)
12 Months Ended
Dec. 31, 2015
USD ($)
customer
Dec. 31, 2014
customer
Accounting Policies [Abstract]    
Allowance for doubtful accounts receivable | $ $ 139,000  
Bad debt expense percentage of revenues (percentage) 1.00% 1.00%
Accounts receivable, number of major customers (customers) 1 2
Accounts receivable, major customer (percentage)   29.00%
Revenue, number of major customer (customers) 1 1
Revenue, major customer (percentage) 14.00% 10.00%