Net Income (Loss) per Share

The following table sets forth the calculation of basic and diluted net income (loss) per share attributable to common stockholders during the periods presented (in thousands, except per share amounts):



	Year Ended December 31,
	2019			2018			2017
Numerator:
Net income (loss)	$	(12,884	)	$	13,938		$	1,837
Participating securities:
Income allocated to participating securities	—			(4,415		)	(1,837		)
Net income (loss) attributable to common stockholders	(12,884		)	9,523			—

Denominator:
Weighted-average shares, basic	37,119			24,862			2,735
Dilutive effect of restricted stock units and awards	—			11			—
Dilutive effect of common stock options	—			5,086			—
Weighted-average common shares outstanding, diluted	37,119			29,959			2,735
Net income (loss) per share attributable to common stockholders:
Basic	$	(0.35	)	$	0.38		$	0.00
Diluted	$	(0.35	)	$	0.32		$	0.00

The following potentially dilutive shares of restricted stock awards and units, employee stock purchase plan, and stock options were not included in the calculation of diluted shares above as the effect would have been anti‑dilutive (in thousands):



	Year Ended December 31,
	2019	2018	2017
Convertible preferred stock	—	—	23,095
Preferred stock warrants	—	—	214
Restricted stock units and awards	2,426	622	—
Common stock options	4,239	—	5,369
Total	6,665	622	28,678