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Summary of Significant Accounting Policies - Doubtful Accounts (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Changes in allowance for doubtful accounts    
Beginning balance $ 89,000 $ 17,000
Bad debt provision (5,000) 72,000
Accounts written-off (5,000)  
Ending balance $ 79,000 $ 89,000