Net Loss Per Share

Basic net loss per share is calculated by dividing net loss by the weighted average number of shares outstanding during each period. Diluted net (loss) income per share is calculated by dividing net (loss) income by the diluted number of shares outstanding during each period. Except where the result would be anti-dilutive to net loss, diluted net loss per share would be calculated assuming the impact of the conversion of the 2023 Notes, the conversion of our preferred shares, the exercise of outstanding equity compensation awards, and ordinary shares expected to be issued under our employee stock purchase plan (“ESPP”).

We have a choice to settle the conversion obligation under the 2023 Notes in cash, shares or any combination of the two. We utilize the if-converted method to reflect the impact of the conversion of the 2023 Notes, unless the result is anti-dilutive. This method assumes the conversion of the 2023 Notes into shares of our ordinary shares and reflects the elimination of the interest expense related to the 2023 Notes.

The dilutive effect of the warrants, stock options, restricted stock units, preferred shares and ordinary shares expected to be issued under or ESPP has been calculated using the treasury stock method.

A reconciliation of basic and diluted net loss per share, together with the related shares outstanding in thousands is as follows:



	Three Months Ended March 31,
Net Loss Per Share:	2020			2019

Net loss	$	(865	)	$	(13,018	)

Weighted average shares:
Basic shares	41,057			37,354
Effect of dilutive securities—employee and director equity awards outstanding, preferred shares and 2023 Notes	—			—
Diluted shares	41,057			37,354

Net loss per share - basic	$	(0.02	)	$	(0.35	)
Net loss per share - diluted	$	(0.02	)	$	(0.35	)

Potential common shares of 15,858 and 19,762 were excluded from the calculation of weighted average shares for the three months ended March 31, 2020 and 2019, respectively, because their effect was considered to be anti-dilutive. For the three months ended March 31, 2020 and 2019, the effects of dilutive securities were entirely excluded from the calculation of net loss per share as a net loss was reported in this period.