Summary of Significant Accounting Policies - Changes in Allowance for Doubtful Accounts (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Regulatory Assets [Abstract]
Beginning balance	$ 760,917	$ 319,735
Bad debt expense, net of recoveries	265,176	441,338
Uncollectible accounts written off	(439,152)	(156)
Ending balance	$ 586,941	$ 760,917