10. Net Loss Per Share

Basic net loss per share was calculated as follows for the three months ended March 31, 2020 and 2019.


	Three Months Ended March 31,
	2020			2019
Numerator:
Net loss attributable to common stockholders	$	(21,512)	$	(17,124)
Denominator:
Weighted average common shares outstanding, basic		51,900,882		42,251,292
Net loss per share attributable to common stockholders, basic	$	(0.41)	$	(0.41)

For the three months ended March 31, 2020 there is no dilutive impact. Therefore, diluted net loss per share is the same as basic net loss per share. Diluted net loss per share was calculated as follows for the three months ended March 31, 2019:


		Three Months Ended March 31,
		2019
Net loss attributable to common stockholders, basic	$	(17,124)
Interest expense on 2026 Convertible Notes		356
Change in fair value of derivative liability		(3,223)
Net loss attributable to common stockholders, diluted	$	(19,991)

Weighted average common shares outstanding, basic		42,251,292
Shares issuable upon conversion of 2026 Convertible Notes, as if converted		1,923,077
Weighted average common shares outstanding, diluted		44,174,369

Net loss per share attributable to common stockholders, diluted		(0.45)

The Company excluded the following common stock equivalents, outstanding as of March 31, 2020 and 2019, from the computation of diluted net loss per share for the three months ended March 31, 2020 and the three months ended March 31, 2019 because they had an anti-dilutive impact. The Company also excluded the shares issuable upon conversion of the 2026 Convertible notes from the computation of diluted net loss per share for the three months ended March 31, 2020 because they had an anti-dilutive impact.


	As of March 31,
	2020	2019
Options to purchase common stock	9,292,354	7,296,948
Warrants for the purchase of common stock	18,939	18,939
	9,311,293	7,315,887