STOCKHOLDERS' EQUITY (Tables)

9 Months Ended

Sep. 30, 2020

Stockholders' Equity Note [Abstract]

Schedule of Stock by Class

The following table presents the number of shares authorized and issued as of the dates indicated:

	September 30, 2020		December 31, 2019
	Shares Authorized	Shares Issued	Shares Authorized	Shares Issued
Stockholders’ equity:
Common stock, $0.000001 par value	200,000,000	73,976,487	200,000,000	71,185,468
Undesignated preferred stock	10,000,000	—	10,000,000	—

Schedule of Stock Option Activity

A summary of stock option activity for the nine months ended September 30, 2020 is as follows:

	Number of Shares	Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2019	6,210,385	$	25.10	4.3	$	75,805
Granted	146,500	31.42
Exercised	(285,388)	12.64
Canceled	(182,616)	47.34
Outstanding at September 30, 2020	5,888,881	$	25.17	3.9	$	21,260
Options vested and exercisable at September 30, 2020	5,199,107	$	23.63	3.4	$	21,260

Schedule of RSU Activity

A summary of RSU and PRSU activity for the nine months ended September 30, 2020 is as follows:

	Number of Shares	Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2019	7,625,584	$	36.51
Granted	3,424,706	32.69
Vested(1)	(2,411,208)	36.80
Canceled	(1,391,090)	36.56
Nonvested at September 30, 2020	7,247,992	$	34.60

(1) Includes 339,274 shares that vested but were not issued due to net share settlement for payment of employee taxes.

Schedule of Stock-Based Compensation Expense

The following table summarizes the effects of stock-based compensation expense related to stock-based awards in the condensed consolidated statements of operations during the periods presented (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Cost of revenue	$	849	$	1,054	$	2,835	$	3,415
Sales and marketing	7,196		7,683		22,194		23,143
Product development	15,551		15,250		50,133		46,572
General and administrative	6,659		5,249		17,428		17,876
Total stock-based compensation recorded to income (loss) before income taxes	30,255		29,236		92,590		91,006
Provision for (benefit from) income taxes	378		(7,661)		(23,831)		(23,766)
Total stock-based compensation recorded to net (loss) income	$	30,633	$	21,575	$	68,759	$	67,240