Series A Redeemable Convertible Preferred Stock (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Embedded Derivative Instruments Rollforward

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 three and nine months ended September 30, 2018 and 2017, were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Beginning Balance	$	482,871	$	419,560	$	445,838	$	336,862
Total loss recognized in earnings	15,215		5,076		52,248		87,774
Ending Balance	$	498,086	$	424,636	$	498,086	$	424,636

Reconciliation of net (loss) income attributable to common stockholders

The following represents a reconciliation of net loss attributable to common stockholders for the three and nine months ended September 30, 2018 and 2017, respectively:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2018			2017		2018			2017
Net income (loss)	$	(332,429	)	$	1,429,173	$	(829,656	)	$	(322,825	)
Effects of Series A redeemable convertible preferred stock:
Less: Accrual of Series A redeemable convertible preferred stock dividends	229,022			215,000		687,152			634,664
Less: Deemed dividend on Series A redeemable convertible preferred stock	—			—		2,269,042			—
Less: Accretion to redemption value of Series A redeemable convertible preferred stock	124,993			—		240,743			—
Net income (loss) attributable to common stockholders	$	(686,444	)	$	1,214,173	$	(4,026,593	)	$	(957,489	)