Investments (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2015

Dec. 31, 2014

Investments [Abstract]

Schedule of Held-To-Maturity Investments Estimated Fair Value of Investments

	Amortized Cost		Gross Unrealized (Losses)			Estimated Fair Value
December 31, 2014
Certificates of deposit, corporate notes and bonds	$	10,698,982	$	(2,209	)	$	10,696,773
September 30, 2015
Certificates of deposit, tri-party repurchase agreement, corporate notes and bonds	$	6,742,987	$	(2,814	)	$	6,740,173

	Amortized Cost		Gross Unrealized (Losses)		Estimated Fair Value
2014
Certificates of deposit, commercial paper	$	10,698,982	$	(2,209)	$	10,696,773
2013
Certificates of deposit, commercial paper	$	17,297,165	$	(16,493)	$	17,280,672

Schedule of Maturities of Held-To-Maturity Investments

	Less than 1 Year		Total
Certificates of deposit, tri-party repurchase agreement, corporate notes and bonds	$	6,742,987	$	6,742,987

	Less than 1 Year		Total
2014
Certificates of deposit, commercial paper	$	10,698,982	$	10,698,982
2013
Certificates of deposit, commercial paper	$	17,297,165	$	17,297,165