2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The components of basic and diluted net loss per share were as follows (in thousands, except loss per share data):

	Year Ended December 31,
Numerator:	2022			2021			2020
Net loss available for common shareholders	$	(53,091	)	$	(43,200	)	$	(13,634	)
Denominator:
Weighted-average common shares outstanding		165,958			160,662			139,829
Net loss per share - basic and diluted	$	(0.32	)	$	(0.27	)	$	(0.10	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

During each of the years ended December 31, 2022, 2021 and 2020, we excluded the following securities from net loss per share as the effect of including them would have been anti-dilutive. The shares shown represent the number of shares of common stock which would be issued upon conversion in the respective years shown below (in thousands):

	Year Ended December 31,
	2022		2021		2020
Options outstanding		945		1,533		3,281
Nonvested restricted stock units		8,866		2,625		1,982
		9,811		4,158		5,263

Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

The following table summarizes the amount of share-based compensation expense by line item on the Statement of Operations (in thousands):

	Year Ended December 31,
	2022		2021		2020
Research and development expense		6,933		6,125		699
Sales, marketing, general and administrative expense		8,528		9,159		598
	$	15,461	$	15,284	$	1,297