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Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Summary of Stock Option Activity

The following table summarizes the stock option activity for the three months ended March 31, 2021:

		Shares (in thousands)				Weighted- average Exercise Price				Weighted- average Remaining Contractual Term (Years)
Outstanding at December 31, 2020			18,912			$	19.59				7.21
Granted			102			$	18.96
Exercised			(71	)		$	15.86
Expired and forfeited			(148	)		$	20.81
Outstanding at March 31, 2021			18,795			$	19.59				6.92

Summary of Restricted Stock Unit Activity

The following table summarizes the restricted stock unit activity for the three months ended March 31, 2021:

		Shares (in thousands)				Weighted Average Grant Date Fair Value
Outstanding at December 31, 2020			603			$	15.84
Granted			17			$	18.93
Released			(39	)		$	15.98
Expired and forfeited			(11	)		$	15.85
Outstanding at March 31, 2021			570			$	15.93

Summary of Stock-Based Compensation Expense related to Stock-Based Payment Awards Granted

The following table summarizes stock-based compensation expense related to stock-based payment awards granted pursuant to all of our equity compensation arrangements (in thousands):

		Three Months Ended March 31,
		2021				2020
Research and development		$	4,937			$	5,287
General and administrative			2,786				3,431
Sales and marketing			3,763				3,256
Total stock-based compensation expense		$	11,486			$	11,974

Summary of Fair Value of Option Grant on Grant Date Using Black-Scholes Option Pricing Model

We estimated the fair value of each option grant on the grant date using the Black-Scholes option pricing model with the following weighted-average assumptions:

		March 31,
		2021				2020
Risk-free interest rate			0.7	%			1.3	%
Dividend yield			0.0	%			0.0	%
Volatility			69.4	%			66.2	%
Expected life (years)			6				6

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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 for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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