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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2020

Equity [Abstract]

Summary of Stock Option Activity

The following table summarizes the stock option activity for the nine months ended September 30, 2020:

		Shares (in thousands)				Weighted- average Exercise Price				Weighted- average Remaining Contractual Term (Years)
Balance at December 31, 2019			16,665			$	20.47				7.87
Granted			316			$	18.32
Exercised			(159	)		$	11.54
Expired and forfeited			(740	)		$	21.92
Balance at September 30, 2020			16,082			$	20.45				7.06

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 September 30,								Nine Months Ended September 30,
		2020				2019				2020				2019
Research and development		$	4,612			$	4,365			$	14,580			$	14,123
General and administrative			3,277				2,939				10,012				10,333
Sales and marketing			3,206				2,400				9,591				15,856
Total stock-based compensation expense		$	11,095			$	9,704			$	34,183			$	40,312

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:

		September 30,
		2020				2019
Risk-free interest rate			0.9	%			2.1	%
Dividend yield			0.0	%			0.0	%
Volatility			67.3	%			67.4	%
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 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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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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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