Available for Sale Securities (Tables)

12 Months Ended

Dec. 31, 2015

Investments Debt And Equity Securities [Abstract]

Summary of Available-for-sale Securities

The following is a summary of the Company’s available-for-sale securities at December 31, 2015:  

			Gross		Gross			Fair Value
	Amortized		Unrealized		Unrealized			(Net Carrying
	Cost		Gains		Losses			Amount)
US Treasury securities and obligations of US government    agencies	$	17,914,136	$	—	$	(26,744	)	$	17,887,392
Corporate debt securities		12,932,629		397		(15,010	)		12,918,016
Total available-for-sale securities	$	30,846,765	$	397	$	(41,754	)	$	30,805,408

Summary of Contractual Maturities of Debt Investment Securities

Contractual maturities of debt investment securities at December 31, 2015, are shown below.

	Under
	1 Year		1 to 2 Years		Total
US Treasury securities and obligations of US government    agencies	$	16,592,324	$	1,295,068	$	17,887,392
Corporate debt securities		11,609,183		1,308,833		12,918,016
Total available-for-sale securities	$	28,201,507	$	2,603,901	$	30,805,408

Summary of Debt Securities with Unrealized Losses

The following table shows the gross unrealized losses and fair values of the Company’s investments that have unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2015:

	Under 1 Year					1 to 2 Years				Total
			Gross					Gross				Gross
	Fair		Unrealized			Fair		Unrealized		Fair		Unrealized
	Value		Losses			Value		Losses		Value		Losses
US Treasury securities and obligations of US    government agencies	$	17,887,392	$	(26,744	)	$	—	$	—	$	17,887,392	$	(26,744	)
Corporate debt securities		5,822,919		(15,010	)		—		—		5,822,919		(15,010	)
Total available-for-sale securities with unrealized    losses	$	23,710,311	$	(41,754	)	$	—	$	—	$	23,710,311	$	(41,754	)