Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Accounts Receivable and Concentration of Credit Risk (Details)

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Summary of Significant Accounting Policies - Accounts Receivable and Concentration of Credit Risk (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Accounts Receivable and Concentration of Credit Risk    
Reserve for accounts deemed uncollectible (as a percent) 100.00%  
Allowance for doubtful accounts reserve balance $ 272,000 $ 192,000
Minimum    
Accounts Receivable and Concentration of Credit Risk    
Age of doubtful accounts 60 days