Organization and summary of significant accounting policies (Tables)

12 Months Ended

Dec. 31, 2015

ASU 2015-03

Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]

Summary of Retrospective Adjustments to Conform Prior Period Classification with New Guidance

The following table summarizes the retrospective adjustments made to conform prior period classifications to the new guidance:

	December 31, 2014
	As filed			Reclassification			As Adjusted
Intangible assets, net of accumulated amortization (included    deferred financing costs)	$	1,949,498		$	(84,656	)	$	1,864,842
Long-term debt, net of current portion and deferred financing    costs	$	(8,383,280	)	$	84,656		$	(8,298,624	)

ASU 2015-17

Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]

Summary of Retrospective Adjustments to Conform Prior Period Classification with New Guidance

The following table summarizes the adjustments made to conform prior period classifications to the new guidance:

	December 31, 2014
	As filed			Reclassification			As Adjusted
Current deferred income tax assets	$	240,626		$	(240,626	)	$	—
Long-term deferred income tax liabilities	$	(890,701	)	$	240,626		$	(650,075	)
Net deferred tax liability	$	(650,075	)	$	—		$	(650,075	)