STOCKHOLDERS' EQUITY (Tables)

6 Months Ended

Jun. 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:

	June 30, 2020		December 31, 2019
	Shares Authorized	Shares Issued	Shares Authorized	Shares Issued
Stockholders’ equity:
Common stock, $0.000001 par value	200,000,000	73,121,229	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 six months ended June 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	86,500	28.94
Exercised	(222,357)	12.56
Canceled	(127,031)	48.80
Outstanding at June 30, 2020	5,947,497	$	25.12	4.1	$	30,482
Options vested and exercisable at June 30, 2020	5,201,796	$	23.40	3.5	$	30,482

Schedule of RSU Activity

A summary of RSU and PRSU activity for the six months ended June 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	2,882,266	34.63
Vested(1)	(1,618,981)	36.78
Canceled	(1,012,928)	36.69
Nonvested at June 30, 2020	7,875,941	$	35.74

⁽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 June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Cost of revenue	$	943	$	1,118	$	1,986	$	2,361
Sales and marketing	7,302		7,774		14,998		15,461
Product development	16,827		15,247		34,582		31,322
General and administrative	5,513		6,313		10,769		12,626
Total stock-based compensation recorded to (loss) income before income taxes	30,585		30,452		62,335		61,770
Benefit from income taxes	(11,652)		(7,993)		(24,209)		(16,105)
Total stock-based compensation recorded to net (loss) income	$	18,933	$	22,459	$	38,126	$	45,665