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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

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 (in thousands):

		Years ended December 31,
		2019				2020
Service costs		$	113			$	36
Sales and marketing			469				1,041
Product development			233				358
General and administrative			2,000				2,172
Total stock-based compensation		$	2,815			$	3,607

Assumptions to Estimate Fair Value for Stock Options at Grant Date

The following assumptions were used in determining the fair value of time-vested stock options granted for the periods indicated:

		Years ended December 31,
		2019		2020
Expected life (in years)		4.00-6.25		4.00-6.25
Risk-free interest rate		1.57% - 2.22%		0.17% - 1.22%
Expected volatility		39% to 50%		46% - 54%
Weighted average expected volatility		38%		52%

Stock Option, Restricted Stock Award, and Restricted Stock Unit Activity

Stock option, restricted stock award, and restricted stock unit activity during the period is as follows:

		Options and Restricted Stock available for grant (in thousands)				Number of options outstanding (in thousands)				Weighted average exercise price of options				Weighted average remaining contractual term (in years)				Aggregate intrinsic value (in thousands)
Balance at December 31, 2019			11,566				4,782			$	4.80				5.82			$	1,585
Increase to pool January 1, 2020			2,214				—
Options granted			(760	)			760			$	2.29
Restricted stock granted			(560	)			—
Restricted stock forfeited			21				—
Options exercised			—				—
Options cancelled			1,472				(1,472	)			5.81
Options expired			477				(477	)		$	5.12
Options forfeited			133				(133	)		$	3.48
Balance at December 31, 2020			14,563				3,460			$	3.82				6.50			$	27
Options exercisable at December 31, 2020							1,934			$	4.51				5.10			$	—

Information Related to Stock Compensation Activity

Information related to stock compensation activity during the period indicated is as follows:

		Years ended December 31,
		2019				2020
Weighted average fair value of options granted		$	1.62			$	1.08
Intrinsic value of options exercised (in thousands)		$	496			$	-
Total grant date fair value of restricted stock vested    (in thousands)		$	1,545			$	2,666

Summary of Restricted Stock Awards and Restricted Stock Units

Restricted stock awards and restricted stock unit activity during the period is as follows:

		Shares/ Units (in thousands)				Weighted Average Grant Date Fair Value
Unvested at December 31, 2019			1,786			$	3.70
Granted			560				2.26
Vested			(693	)			3.79
Forfeited			(21	)			2.72
Unvested at December 31, 2020			1,632				3.18

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