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Summary of Significant Accounting Policies - Contract with Customer, Asset and Liability (Details)	6 Months Ended
	Jun. 30, 2018 USD ($)
Accounting Policies [Abstract]
Balance at December 31, 2017	$ 378,896,803
Cumulative effect of accounting change	(1,780,050)
Billings in advance of revenue recognition	186,526
Revenue recognized	(740,281)
Balance at March 31, 2018	$ 376,562,998

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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-Name Accounting Standards Codification
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