Net Loss Per Share

Because of the net losses in the years ended December 31, 2019, 2018 and 2017, the following outstanding Company securities, using the treasury stock method, were excluded from the calculations of net loss per share because the effect would have been anti-dilutive:



	Year Ended December 31,
	2019	2018	2017
Common stock options	62	11,276	52,029
Restricted stock awards	3,501	11,616	11,898
Restricted stock units	70,472	21,974	25,005
Warrants	1,522,002	—	—
Total	1,596,037	44,866	88,932

For purposes of calculating the maximum dilutive impact, it is presumed that the convertible notes will be settled in common stock and all conversion features within the term loan facility will be exercised with the resulting potential common shares included in diluted earnings per share if the effect is more dilutive. The effect of the conversion of the convertible senior notes and term loan facility is excluded from the calculation of diluted loss per share because the impact of these securities would be anti-dilutive.

The potential dilutive effect of these securities is shown in the table below:



	Year Ended December 31,
	2019	2018	2017
Convertible notes	8,211,088	755,695	1,193,938
Conversion features under term loan facility	10,486,604	1,522,002	647,001

The effect of the contingently issuable common stock (see Note 9) is excluded from the calculation of basic net loss per share until all necessary conditions for issuance have been satisfied.