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		38,475,000
Non-cash compensation recognized on stock options and ESPP	30		30
Restricted stock grants, net of cancellations	1,411	$ 1	1,410
Restricted stock grants, net of cancellations, shares		1,000,000
Cancellation of shares for payment of withholding tax	(868)		(868)
Cancellation of shares for payment of withholding tax, shares		(176,000)
Employee stock purchase plan	5		5
Employee stock purchase plan, shares		2,000
Exercise of common stock warrants	4,196	$ 2	4,194
Exercise of common stock warrants, shares		2,047,000
Exercise of stock options	16		16
Exercise of stock options, shares		8,000
Net income (loss)	3,424			3,424
BALANCE at Jun. 30, 2020	56,898	$ 41	278,828	(221,971)
BALANCE, Shares at Jun. 30, 2020		41,356,000
BALANCE at Mar. 31, 2020	52,853	$ 40	276,163	(223,350)
BALANCE, Shares at Mar. 31, 2020		40,383,000
Non-cash compensation recognized on stock options and ESPP	17		17
Restricted stock grants, net of cancellations	791		791
Cancellation of shares for payment of withholding tax	(296)		(296)
Cancellation of shares for payment of withholding tax, shares		(66,000)
Exercise of common stock warrants	2,151	$ 1	2,150
Exercise of common stock warrants, shares		1,038,000
Exercise of stock options	3		3
Exercise of stock options, shares		1,000
Net income (loss)	1,379			1,379
BALANCE at Jun. 30, 2020	56,898	$ 41	278,828	(221,971)
BALANCE, Shares at Jun. 30, 2020		41,356,000
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	$ 39		39
Restricted stock grants, net of cancellations	2,255	$ 1	2,254
Restricted stock grants, net of cancellations, shares		1,070,000
Cancellation of shares for payment of withholding tax	(1,309)		(1,309)
Cancellation of shares for payment of withholding tax, shares		(211,000)
Employee stock purchase plan	15		15
Employee stock purchase plan, shares		4,000
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 Family Safety Mobile acquisition, net	8,381	$ 1	8,380
Common shares issued in connection with Avast Family Safety Mobile acquisition, net, shares		1,460,000
Exercise of common stock warrants	40	$ 1	39
Exercise of common stock warrants, shares		484,000
Exercise of stock options	53		53
Exercise of stock options, shares		15,000
Net income (loss)	(8,428)			(8,428)
BALANCE at Jun. 30, 2021	$ 119,473	$ 54	349,077	(229,658)
BALANCE, Shares at Jun. 30, 2021	53,575,888	53,576,000
BALANCE at Mar. 31, 2021	$ 115,655	$ 52	340,058	(224,455)
BALANCE, Shares at Mar. 31, 2021		51,646,000
Non-cash compensation recognized on stock options and ESPP	21		21
Restricted stock grants, net of cancellations	1,258		1,258
Restricted stock grants, net of cancellations, shares		100,000
Cancellation of shares for payment of withholding tax	(484)		(484)
Cancellation of shares for payment of withholding tax, shares		(90,000)
Costs associated with common stock offering	(188)		(188)
Common shares issued in connection with Avast Family Safety Mobile acquisition, net	8,381	$ 1	8,380
Common shares issued in connection with Avast Family Safety Mobile acquisition, net, shares		1,460,000
Exercise of common stock warrants		$ 1	(1)
Exercise of common stock warrants, shares		451,000
Exercise of stock options	33		33
Exercise of stock options, shares		9,000
Net income (loss)	(5,203)			(5,203)
BALANCE at Jun. 30, 2021	$ 119,473	$ 54	$ 349,077	$ (229,658)
BALANCE, Shares at Jun. 30, 2021	53,575,888	53,576,000