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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following tables reconcile the components of the numerator and denominator included in the calculations of diluted net loss per share:

	Year Ended December 31,
	2019				2018				2017
Numerator
Net loss attributable to Inovio Pharmaceuticals, Inc. (numerator for use in basic net loss per share)	$	(119,359,219	)		$	(96,967,830	)		$	(88,205,772	)
Adjustment for decrease in fair value of warrant liability	—				—				(806,819		)
Numerator for use in diluted net loss per share	$	(119,359,219	)		$	(96,967,830	)		$	(89,012,591	)
Denominator
Weighted average number of common shares outstanding (denominator for use in basic net loss per share)	98,717,999				92,539,997				81,777,493
Effect of dilutive potential common shares	—				—				140,529
Denominator for use in diluted net loss per share	98,717,999				92,539,997				81,918,022
Net loss per share, diluted	$	(1.21	)		$	(1.05	)		$	(1.09	)
Net loss per share, basic	$	(1.21	)		$	(1.05	)		$	(1.08	)

Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect

The following table summarizes potential shares of common stock that were excluded from diluted net loss per share calculation because of their anti-dilutive effect:

	Year Ended December 31,
	2019			2018			2017
Options to purchase common stock	9,265,390			8,752,677			7,694,870
Restricted stock units	2,069,936			1,688,017			1,234,168
Convertible preferred stock	8,456			8,456			8,456
Convertible notes	14,585,653			—			—
August 2019 Bonds	3,799,071			—			—
December 2019 Bonds	1,009,450			—			—
Total	30,737,956			10,449,150			8,937,494

Summary of assumptions used to estimate the fair value of stock options

The weighted average assumptions used in the Black-Scholes model for option grants to employees and directors are presented below:

	Year Ended December 31,
	2019		2018		2017
Risk-free interest rate	2.42%		2.73%		2.20%
Expected volatility	70%		72%		73%
Expected life in years	6		6		6
Dividend yield	—		—		—

The weighted average assumptions used in the Black-Scholes model for option grants to non-employees are presented below:

	Year Ended December 31,
	2019		2018		2017
Risk-free interest rate	2.45%		2.71%		2.42%
Expected volatility	88%		78%		99%
Expected life in years	10		9		9
Dividend yield	—		—		—

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

The impact of the adoption of Topic 842 on the consolidated balance sheets as of January 1, 2019 was as follows:

	ASC 840								Topic 842
	January 1, 2019				Impact of Adoption				January 1, 2019
Deferred rent, current portion	$	1,065,387			$	(1,065,387	)		$	—
Deferred rent, non-current portion	$	8,518,207			$	(8,518,207	)		$	—
Operating right-of-use assets	$	—			$	14,634,769			$	14,634,769
Operating lease liability, current portion	$	—			$	1,733,600			$	1,733,600
Operating lease liability, non-current portion	$	—			$	22,484,763			$	22,484,763

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