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Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2022

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):

		Three Months Ended March 31,
		2021				2022
Service costs		$	8			$	34
Sales and marketing			229				191
Product development			97				82
General and administrative			410				388
Total stock-based compensation		$	744			$	695

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:

		Three Months Ended March 31,
		2021		2022
Expected life (in years)		4.0 - 6.25		4.0 - 6.25
Risk-free interest rate		0.64%-1.16%		2.41%-2.44%
Expected volatility		50%-56%		51%-60%

Summary of Stock Option Activity

Stock option activity during the three months ended March 31, 2022 is summarized as follows:

		Shares (in thousands)				Weighted average exercise price				Weighted average remaining contractual term (in years)
Balance at December 31, 2021			3,601			$	3.43				6.46
Options granted			254				2.56
Options forfeited			(49	)			3.41
Options expired			(122	)			3.38
Options exercised			(2	)			1.66
Balance at March 31, 2022			3,682			$	3.37				6.65

Summary of Restricted Stock Awards and Restricted Stock Units

Restricted stock awards and restricted stock unit activity during the three months ended March 31, 2022 is summarized as follows:

		Shares/ Units (in thousands)				Weighted average grant date fair value
Unvested balance at December 31, 2021			1,518			$	2.80
Granted			251				2.55
Vested			(102	)			2.73
Forfeited			(15	)			3.66
Unvested balance at March 31, 2022			1,652			$	2.76

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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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