Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details)

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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Long-term portion $ 20,265,745 $ 24,701,693
ASU 2015-03    
Other noncurrent assets   (846,000)
Long-term portion   $ (846,000)