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	61		61
Restricted stock grants, net of cancellations (in shares)		1,222,000
Restricted stock grants, net of cancellations	3,561	$ 1	3,560
Employee stock purchase plan (in shares)		10,000
Employee stock purchase plan	37		37
Cancellation of shares for payment of withholding tax (in shares)		(298,000)
Cancellation of shares for payment of withholding tax	(1,736)		(1,736)
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)		1,408,000
Exercise of common stock warrants	2,066	$ 2	2,064
Exercise of stock options (in shares)		18,000
Exercise of stock options	58		58
Net loss	(27,035)			(27,035)
BALANCE, at end of period (in shares) at Sep. 30, 2021		54,574,000
BALANCE, at end of period at Sep. 30, 2021	103,820	$ 55	352,030	(248,265)
BALANCE, at beginning of period (in shares) at Jun. 30, 2021		53,576,000
BALANCE, at beginning of period at Jun. 30, 2021	119,473	$ 54	349,077	(229,658)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash compensation recognized on stock options and ESPP	22		22
Restricted stock grants, net of cancellations (in shares)		152,000
Restricted stock grants, net of cancellations	1,305	$ 0	1,305
Employee stock purchase plan (in shares)		5,000
Employee stock purchase plan	27		22
Cancellation of shares for payment of withholding tax (in shares)		(86,000)
Cancellation of shares for payment of withholding tax	(427)		(427)
Exercise of common stock warrants (in shares)		924,000
Exercise of common stock warrants	2,025	$ 1	2,024
Exercise of stock options (in shares)		3,000
Exercise of stock options	7		7
Net loss	(18,607)			(18,607)
BALANCE, at end of period (in shares) at Sep. 30, 2021		54,574,000
BALANCE, at end of period at Sep. 30, 2021	$ 103,820	$ 55	352,030	(248,265)
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	66		66
Restricted stock grants, net of cancellations (in shares)		1,192,000
Restricted stock grants, net of cancellations	3,783	$ 1	3,782
Employee stock purchase plan (in shares)		17,000
Employee stock purchase plan	40		40
Cancellation of shares for payment of withholding tax (in shares)		(347,000)
Cancellation of shares for payment of withholding tax	(1,084)		(1,084)
Common shares issued in stock offering, net offering costs (in shares)		1,132,000
Common shares issued in stock offering, net of offering costs	$ 1,309	$ 1	1,308
Exercise of stock options (in shares)	8,000	8,000
Exercise of stock options	$ 16		16
Net loss	$ (21,307)			(21,307)
BALANCE, at end of period (in shares) at Sep. 30, 2022	56,260,670	56,261,000
BALANCE, at end of period at Sep. 30, 2022	$ 83,383	$ 56	356,907	(273,580)
BALANCE, at beginning of period (in shares) at Jun. 30, 2022		55,120,000
BALANCE, at beginning of period at Jun. 30, 2022	86,928	$ 55	354,641	(267,768)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash compensation recognized on stock options and ESPP	22		22
Restricted stock grants, net of cancellations (in shares)		59,000
Restricted stock grants, net of cancellations	1,074		1,074
Employee stock purchase plan (in shares)		11,000
Employee stock purchase plan	21		21
Cancellation of shares for payment of withholding tax (in shares)		(61,000)
Cancellation of shares for payment of withholding tax	(159)		(159)
Common shares issued in stock offering, net offering costs (in shares)		1,132,000
Common shares issued in stock offering, net of offering costs	1,309	$ 1	1,308
Net loss	$ (5,812)			(5,812)
BALANCE, at end of period (in shares) at Sep. 30, 2022	56,260,670	56,261,000
BALANCE, at end of period at Sep. 30, 2022	$ 83,383	$ 56	$ 356,907	$ (273,580)