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Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2021

Share-based Payment Arrangement [Abstract]

Stock-Based Compensation Expense for Employees and Non-Employees

Total share-based compensation expense recorded for employees and non-employees is as follows (in thousands):

			Three Months Ended March 31,
			2021						2020
Cost of revenues			$	362					$	169
Research and development			7,959						6,991
Sales and marketing			2,919						2,186
General and administrative			11,860						8,988
Total share-based compensation expense			$	23,100					$	18,334

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The following table summarizes the key assumptions used to determine the fair value of the awards:

															Three Months Ended March 31, 2021
Expected term (years)															3.00
Expected volatility															49.04		%
Dividend yield															—		%
Risk-free interest rate															0.27		%

Summary of Restricted Stock Unit Activity

Activity for RSUs and PSUs is as follows:

			RSUs and PSUs Outstanding
			Shares Outstanding						Weighted Average Grant Date Fair Value
Balance at December 31, 2020			4,816,000						$	37.82
Granted			1,885,015						87.14
Released			(1,426,075)						29.29
Canceled			(173,936)						38.79
Balance at March 31, 2021			5,101,004						$	58.39

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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