Series A Redeemable Convertible Preferred Stock (Tables)

12 Months Ended

Dec. 31, 2018

The fair value of these derivative instruments and the loss recorded on the change in the fair value of these derivative instruments, which was included in “Interest and other income, net” within the condensed consolidated statement of operations, for the twelve months ended December 31, 2018 and 2017, were as follows:



	Years Ended December 31,
	2018		2017
Beginning Balance	$	445,838	$	336,862
Total loss recognized in earnings	52,248		108,976
Ending Balance	$	498,086	$	445,838

Reconciliation of net loss attributable to common stockholders

The following represents a reconciliation of net loss attributable to common stockholders for the twelve months ended December 31, 2018 and 2017, respectively:



	Years Ended December 31,
	2018			2017
Net income (loss)	$	(906,714	)	$	1,052,401
Effects of Series A redeemable convertible preferred stock:
Less: Accrual of Series A redeemable convertible preferred stock dividends	1,035,977			873,043
Less: Accretion to redemption value of Series A redeemable convertible preferred stock	254,212			—
Less: Deemed dividend on Series A redeemable convertible preferred stock	2,269,042			—
Net income (loss) attributable to common stockholders	$	(4,465,945	)	$	179,358