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STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement [Abstract]

Share-based Payment Arrangement, Option, Activity

A summary of the status of the 2015 Plan and the 2021 Plan as of December 31, 2021 and 2020, and changes during the years then ended is presented below:

			Options Outstanding
			Number of Options						Weighted-Average Exercise Price						Weighted-Average Remaining Contractual Term (In Years)						Aggregate Intrinsic Value (In Thousands)
Outstanding at December 31, 2020			15,611,571						$	2.75					7.74						$	26,879
Granted			5,037,018						7.18
Exercised			(3,274,745)						1.67												33,991
Forfeited			(898,899)						4.30
Cancelled			(104,272)						4.06
Outstanding at December 31, 2021			16,370,673						$	4.23					7.70						$	177,593
Vested and exercisable at December 31, 2021			7,607,376						2.35						6.61						97,271
Amount expected to vest at December 31, 2021			8,763,297						$	5.87					8.69						$	80,322

Schedule of Stock-based Compensation Expense

Stock-based compensation expense, included in selling, general, and administrative expense in the consolidated statements of operations and comprehensive loss, for the years ended December 31, 2021, 2020, and 2019, was comprised of the following:

(in thousands)			December 31, 2021						December 31, 2020						December 31, 2019
Employee and non-employee stock options			$	9,409					$	6,594					$	4,133
Restricted stock awards relating to founder shares			—						—						113
ESPP			128						—						—
RSUs			207						—						—
			$	9,744					$	6,594					$	4,246

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following weighted average assumptions were used for issuances during the years ended December 31, 2021, 2020, and 2019, for employees and non-employees:

Employees and non-employees—

			December 31, 2021						December 31, 2020						December 31, 2019
Risk-free interest rate			0.98		%				0.97		%				1.69		%
Dividend yield			—						—						—
Volatility			51.43		%				49.49		%				46.63		%
Expected lives (years)			6.1						6.0						6.6
Fair value of common stock			$	7.95					$	4.98					$	5.17

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The following table summarizes the weighted-average assumptions used in estimating the fair value of the 2021 ESPP grants for the initial offering period using the Black Scholes option-pricing model:

			December 31, 2021
Risk-free interest rate			1.63		%
Dividend yield			—
Volatility			63.00		%
Expected lives (years)			0.6
Fair value of common stock			$	21.04

Share-based Payment Arrangement, Restricted Stock Unit, Activity

RSU activity during the year ended December 31, 2021 was as follows:

			Number of Shares						Weighted-Average Grant Date Fair Value per Share
Unvested at December 31, 2020			—						$	—
Granted			165,333						22.39
Vested			(204)						24.40
Forfeited			(4,902)						24.40
Cancelled			—						—
Unvested at December 31, 2021			160,227						$	22.33

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