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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-based Compensation Expense Included in Operating Expense

Stock-based compensation expense was included in the following operating expense categories as follows (in thousands):

		Nine Months Ended September 30,								Three Months Ended September 30,
		2020				2021				2020				2021
Service costs		$	29			$	15			$	7			$	3
Sales and marketing			758				663				247				213
Product development			261				230				90				45
General and administrative			1,576				1,099				473				347
Total stock-based compensation		$	2,624			$	2,007			$	817			$	608

Assumptions to Estimate Fair Value for Stock Options at Grant Date

The following weighted average assumptions were used in determining the fair value of time-vested stock option grants for the periods presented:

		Nine Months Ended September 30,				Three Months Ended September 30,
		2020		2021		2020				2021
Expected life (in years)		4.0 - 6.25		4.0 - 6.25		4.0				4.0 - 6.25
Risk-free interest rate		0.17%-1.22%		0.64%-1.16%			0.22	%		0.76%-1.15%
Expected volatility		46%-53%		50%-58%			53	%		50-58%

Summary of Stock Option

Stock option activity during the nine months ended September 30, 2021 is summarized as follows:

		Shares (in thousands)				Weighted average exercise price				Weighted average remaining contractual term (in years)
Balance at December 31, 2020			3,460			$	3.82				6.50
Options granted			527				2.46
Options forfeited			(159	)			3.35
Options expired			(227	)			4.97
Options exercised			(69	)			2.64
Balance at September 30, 2021			3,532			$	3.59				6.02

Summary of Restricted Stock Awards and Restricted Stock Units

Restricted stock awards and restricted stock unit activity during the nine months ended September 30, 2021 is summarized as follows:

		Shares/ Units (in thousands)				Weighted average grant date fair value
Unvested balance at December 31, 2020			1,632			$	3.18
Granted			194				2.10
Vested			(214	)			3.05
Forfeited			(224	)			2.88
Unvested balance at September 30, 2021			1,388			$	3.10

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

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