Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Comprehensive Deficit
BALANCE, at beginning of period (in shares) at Dec. 31, 2020		41,233,000
BALANCE, at beginning of period at Dec. 31, 2020	$ 58,716	$ 41	$ 279,905	$ (221,230)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash compensation recognized on stock options and ESPP	39		39
Restricted stock grants, net of cancellations (in shares)		1,070,000
Restricted stock grants, net of cancellations	2,255	$ 1	2,254
Cancellation of shares for payment of withholding tax (in shares)		(211,000)
Cancellation of shares for payment of withholding tax	(1,309)		(1,309)
Employee stock purchase plan (in shares)		4,000
Employee stock purchase plan	19		15
Common shares issued in stock offering, net offering costs (in shares)		9,521,000
Common shares issued in stock offering, net of offering costs	59,711	$ 10	59,701
Common shares issued in connection with Avast Family Safety Mobile acquisition, net (in shares)		1,460,000
Common shares issued in connection with Avast Family Safety Mobile acquisition, net	8,381	$ 1	8,380
Exercise of common stock warrants (in shares)		484,000
Exercise of common stock warrants	40	$ 1	39
Exercise of stock options (in shares)		15,000
Exercise of stock options	53		53
Net loss	(8,428)			(8,428)
BALANCE, at end of period (in shares) at Jun. 30, 2021		53,576,000
BALANCE, at end of period at Jun. 30, 2021	119,473	$ 54	349,077	(229,658)
BALANCE, at beginning of period (in shares) at Mar. 31, 2021		51,646,000
BALANCE, at beginning of period at Mar. 31, 2021	115,655	$ 52	340,058	(224,455)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash compensation recognized on stock options and ESPP	21		21
Restricted stock grants, net of cancellations (in shares)		100,000
Restricted stock grants, net of cancellations	1,258	$ 0	1,258
Cancellation of shares for payment of withholding tax (in shares)		(90,000)
Cancellation of shares for payment of withholding tax	(484)		(484)
Costs associated with common stock offering	(188)		(188)
Common shares issued in connection with Avast Family Safety Mobile acquisition, net (in shares)		1,460,000
Common shares issued in connection with Avast Family Safety Mobile acquisition, net	8,381	$ 1	8,380
Exercise of common stock warrants (in shares)		451,000
Exercise of common stock warrants	0	$ 1	(1)
Exercise of stock options (in shares)		9,000
Exercise of stock options	33		33
Net loss	(5,203)			(5,203)
BALANCE, at end of period (in shares) at Jun. 30, 2021		53,576,000
BALANCE, at end of period at Jun. 30, 2021	$ 119,473	$ 54	349,077	(229,658)
BALANCE, at beginning of period (in shares) at Dec. 31, 2021	54,259,390	54,259,000
BALANCE, at beginning of period at Dec. 31, 2021	$ 100,560	$ 54	352,779	(252,273)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash compensation recognized on stock options and ESPP	44		44
Restricted stock grants, net of cancellations (in shares)		1,132,000
Restricted stock grants, net of cancellations	2,709	$ 1	2,708
Cancellation of shares for payment of withholding tax (in shares)		(285,000)
Cancellation of shares for payment of withholding tax	(925)		(925)
Employee stock purchase plan (in shares)		6,000
Employee stock purchase plan	$ 19		19
Exercise of stock options (in shares)	8,000	8,000
Exercise of stock options	$ 16		16
Net loss	$ (15,496)			(15,496)
BALANCE, at end of period (in shares) at Jun. 30, 2022	55,121,767	55,120,000
BALANCE, at end of period at Jun. 30, 2022	$ 86,928	$ 55	354,641	(267,768)
BALANCE, at beginning of period (in shares) at Mar. 31, 2022		55,156,000
BALANCE, at beginning of period at Mar. 31, 2022	94,183	$ 55	353,403	(259,275)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash compensation recognized on stock options and ESPP	23		23
Restricted stock grants, net of cancellations (in shares)		127,000
Restricted stock grants, net of cancellations	1,665		1,665
Cancellation of shares for payment of withholding tax (in shares)		(164,000)
Cancellation of shares for payment of withholding tax	(452)		(452)
Exercise of stock options (in shares)		1,000
Exercise of stock options	2		2
Net loss	$ (8,493)			(8,493)
BALANCE, at end of period (in shares) at Jun. 30, 2022	55,121,767	55,120,000
BALANCE, at end of period at Jun. 30, 2022	$ 86,928	$ 55	$ 354,641	$ (267,768)