7. SHARE-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

Share-based Compensation Expense by Line Item

The following table summarizes the amount of share-based compensation expense by line item on the statements of operations:

Share-based compensation expense		Three Months Ended				Six Months Ended
		June 30,				June 30,
(in thousands)		2021		2020		2021		2020
Research and development expense	$	2,201	$	103	$	3,387	$	142
Sales, marketing, general and administrative expense		5,696		97		6,148		247
	$	7,897	$	200	$	9,535	$	389

Option Positions

The following table summarizes shares, weighted-average exercise price, weighted-average remaining contractual term and aggregate intrinsic value of options outstanding and options exercisable as of June 30, 2021:

				Weighted-
			Weighted-	Average
			Average	Remaining		Aggregate
Options			Exercise	Contractual		Intrinsic
	Shares		Price	Term (years)		Value
Outstanding as of June 30, 2021	1,764,000	$	1.29	6.8	$	27,272,000
Exercisable as of June 30, 2021	1,001,000	$	1.70	5.9	$	15,072,000

Restricted Stock Unit Activity

The following table summarizes activity and positions with respect to RSUs and PSUs for the six months ended June 30, 2021:

			Weighted-average
	Shares		price
Unvested as of December 31, 2020	1,983,000	$	0.76
Granted	3,670,000		13.10
Vested	(2,152,000)		2.86
Forfeited	(576,000)		7.38
Unvested as of June 30, 2021	2,925,000	$	13.38