Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Share-Based Compensation Expense

The amount of share-based compensation expense recognized by the Company by location in its statements of operations for the years ended December 31, 2020, 2019, and 2018 is as follows (in thousands):

	Years ended December 31,
	2020		2019		2018
Cost of revenues	$	66	$	67	$	21
Sales and marketing		1,813		1,339		926
General and administrative		2,076		1,596		646
Research and development		449		432		150
Total	$	4,404	$	3,434	$	1,743

Summary of Stock Option Activity

The following table summarizes the Company’s stock option activity for the years ended December 31, 2020, 2019 and 2018:

	Number of Shares under Option (in thousands)			Weighted- average Exercise Price per Option		Weighted- average Remaining Contractual Life (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2017		2,444		$	2.39
Granted		584			8.33
Exercised		(194	)		2.60
Forfeited		(123	)		3.73
Outstanding at December 31, 2018		2,711			3.59
Granted		856			14.27
Exercised		(879	)		2.82
Forfeited		(273	)		8.33
Outstanding at December 31, 2019		2,415			7.11
Granted		1,028			2.01
Exercised		(371	)		1.86
Forfeited		(707	)		10.76
Outstanding at December 31, 2020		2,365		$	4.62		6.75		16,779
Exercisable at December 31, 2020		1,071		$	5.31		3.75		7,027
Vested and expected to vest at December 31, 2020		2,365		$	4.62		6.75		16,779

Summary of Weighted-average Inputs and Assumptions used to Estimate Grant-date Fair Value of Stock Options

For the years ended December 31, 2020, 2019, and 2018, the grant-date fair value of stock options was estimated at the time of grant using the following weighted-average inputs and assumptions in the Black-Scholes option pricing model:

	2020			2019			2018
Estimated fair value of common stock	$	2.01		$	14.27		$	8.41
Exercise price	$	2.01		$	14.27		$	8.41
Expected term (in years)		6.1			6.0			6.0
Risk-free interest rate		0.4	%		2.2	%		2.7	%
Expected volatility		59.5	%		55.3	%		65.3	%
Dividend yield		0	%		0	%		0	%

Summary of Restricted Stock Award and Restricted Stock Unit Activity

The following table summarizes the Company’s restricted stock award and restricted stock unit activity for the years ended December 31, 2020, 2019, and 2018:

	Non-vested Restricted Stock Awards (in thousands)			Weighted- average Grant-date Fair Value		Non-vested Restricted Stock Units (in thousands)			Weighted- average Grant-date Fair Value
Non-vested at December 31, 2017		16		$	2.32		-		$	-
Granted		-			-		43			25.21
Vested		(12	)		2.32		-			-
Non-vested at December 31, 2018		4			2.32		43			25.21
Granted		-			-		247			13.89
Vested		(4	)		2.32		(22	)		18.69
Forfeited		-			-		(23	)		15.57
Non-vested at December 31, 2019		-			-		245			15.23
Granted		-			-		2,307			3.18
Vested		-			-		(98	)		13.24
Forfeited		-			-		(594	)		5.24
Non-vested at December 31, 2020		-		$	-		1,860		$	3.58