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):



	Three Months Ended September 30,					Nine Months Ended September 30,
	2019			2018		2019			2018
Numerator:
Net income (loss)	$	(778	)	$	4,009	$	(2,168	)	$	11,578
Participating securities:
Income allocated to participating securities	—			—		—			(4,415		)
Net income (loss) attributable to common stockholders	(778		)	4,009		(2,168		)	7,163

Denominator:
Weighted-average shares, basic	37,262			35,007		37,005			20,946
Dilutive effect of warrants	—			162		—			150
Dilutive effect of restricted stock units and awards	—			15		—			7
Dilutive effect of common stock options	—			5,148		—			5,035
Weighted-average common shares outstanding, diluted	37,262			40,332		37,005			26,138
Net income (loss) per share attributable to common stockholders:
Basic	$	(0.02	)	$	0.11	$	(0.06	)	$	0.34
Diluted	$	(0.02	)	$	0.10	$	(0.06	)	$	0.27

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):



	Three Months Ended September 30,		Nine Months Ended September 30,
	2019	2018	2019	2018
Restricted stock units and awards	1,912	541	1,912	541
Employee stock purchase plan	33	—	77	—
Common stock options	4,529	—	4,529	—
Total	6,474	541	6,518	541