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Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2019

Summary of Stock Option Award Activity

The following table summarizes the stock option award activity under the Stock Plans during the three months ended March 31, 2019:

		Class A Number of Shares				Class B Number of Shares				Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Term (in years)				Aggregate Intrinsic Value(1)
		(in thousands, except per share data)
Outstanding at December 31, 2018			13,322				2,969			$	7.83				6.41			$	34,567
Granted			—				—			$	—				—			$	—
Exercised			(1,260	)			(651	)		$	2.93				—			$	—
Forfeited			(969	)			(29	)		$	13.58				—			$	—
Outstanding at March 31, 2019			11,093				2,289			$	8.10				5.98			$	61,054

(1) The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying stock option awards and the closing market price of our Class A common stock as of December 31, 2018 and March 31, 2019, respectively.

Summary of Total Stock-based Compensation Expense

Total stock-based compensation expense by function was as follows:

	Three Months Ended March 31,
	2019				2018
	(in thousands)
Cost of revenue	$	1,849			$	276
Research and development		112,242				77,815
Sales and marketing		17,760				16,185
General and administrative		30,705				38,982
Total	$	162,556			$	133,258

Restricted Stock Units

Summary of RSU and RSA Award Activity

Restricted Stock Units

The following table summarizes the RSU activity during the three months ended March 31, 2019:

		Class A Outstanding RSUs				Class B Outstanding RSUs				Weighted- Average Grant Date Fair Value per RSU
		(in thousands, except per share data)
Unvested at December 31, 2018			149,638				492			$	13.34
Granted			50,941				—			$	8.50
Vested			(14,343	)			(382	)		$	13.93
Forfeited			(11,496	)			(1	)		$	13.32
Unvested at March 31, 2019			174,740				109			$	11.89

Restricted Stock Awards

Summary of RSU and RSA Award Activity

The following table summarizes the RSA activity during the three months ended March 31, 2019:

				Class A Outstanding RSAs				Weighted- Average Grant Date Fair Value per RSA
				(in thousands, except per share data)
Unvested at December 31, 2018					8,134			$	7.51
Granted					—			$	—
Vested					(546	)		$	8.44
Forfeited					(1,115	)		$	5.58
Unvested at March 31, 2019					6,473			$	7.77

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