Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Comprehensive Deficit [Member]
BALANCE at Dec. 31, 2019	$ 48,684	$ 38	$ 274,041	$ (225,395)
BALANCE, Shares at Dec. 31, 2019		38,476,000
Non-cash compensation recognized on stock options and ESPP	65		65
Restricted stock grants, net of cancellations	2,999	$ 1	2,998
Restricted stock grants, net of cancellations, shares		1,000,000
Cancellation of shares for payment of withholding tax	(1,440)		(1,440)
Cancellation of shares for payment of withholding tax, shares		(309,000)
Employee stock purchase plan	19		19
Employee stock purchase plan, shares		6,000
Exercise of common stock warrants	4,196	$ 2	4,194
Exercise of common stock warrants, shares		2,047,000
Exercise of stock options	28		28
Exercise of stock options, shares		13,000
Net income (loss)	4,165			4,165
BALANCE at Dec. 31, 2020	$ 58,716	$ 41	279,905	(221,230)
BALANCE, Shares at Dec. 31, 2020	41,232,804	41,233,000
Non-cash compensation recognized on stock options and ESPP	$ 83		83
Restricted stock grants, net of cancellations	4,765	$ 1	4,764
Restricted stock grants, net of cancellations, shares		991,000
Cancellation of shares for payment of withholding tax	(2,220)		(2,220)
Cancellation of shares for payment of withholding tax, shares		(385,000)
Employee stock purchase plan	37		37
Employee stock purchase plan, shares		10,000
Common shares issued in stock offering,net of offering costs	59,711	$ 10	59,701
Common shares issued in stock offering, net offering costs, shares		9,521,000
Common shares issued in connection with Avast acquisition, net	8,381	$ 1	8,380
Common shares issued in connection with Avast acquisition, net, shares		1,460,000
Exercise of common stock warrants	2,065	$ 1	2,064
Exercise of common stock warrants, shares		1,408,000
Exercise of stock options	$ 65		65
Exercise of stock options, shares	21,000	21,000
Net income (loss)	$ (31,043)			(31,043)
BALANCE at Dec. 31, 2021	$ 100,560	$ 54	$ 352,779	$ (252,273)
BALANCE, Shares at Dec. 31, 2021	54,259,390	54,259,000