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, 2021		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	21		21
Restricted stock grants, net of cancellations (in shares)		1,005,000
Restricted stock grants, net of cancellations	1,045	$ 1	1,044
Employee stock purchase plan shares issued (in shares)		7,000
Employee stock purchase plan shares issued	26		19
Cancellation of shares for payment of withholding tax (in shares)		(121,000)
Cancellation of shares for payment of withholding tax	(474)		(474)
Exercise of stock options (in shares)		6,000
Exercise of stock options	14		14
Net loss	(7,002)			(7,002)
BALANCE, at end of period (in shares) at Mar. 31, 2022		55,156,000
BALANCE, at end of period at Mar. 31, 2022	$ 94,183	$ 55	353,403	(259,275)
BALANCE, at beginning of period (in shares) at Dec. 31, 2022	56,197,910	56,198,000
BALANCE, at beginning of period at Dec. 31, 2022	$ 76,379	$ 56	357,875	(281,552)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Non-cash compensation recognized on stock options and ESPP	9		9
Restricted stock grants, net of cancellations (in shares)		1,264,000
Restricted stock grants, net of cancellations	935	$ 2	933
Employee stock purchase plan shares issued (in shares)		8,000
Employee stock purchase plan shares issued	8		8
Employee stock purchase plan expense	2		2
Cancellation of shares for payment of withholding tax (in shares)		(111,000)
Cancellation of shares for payment of withholding tax	(211)		(211)
Common shares issued with debt conversion (in shares)		3,237,000
Common shares issued in settlement and prepayment of notes payable	3,649	$ 3	3,646
Net loss	$ (6,887)			(6,887)
BALANCE, at end of period (in shares) at Mar. 31, 2023	60,595,949	60,596,000
BALANCE, at end of period at Mar. 31, 2023	$ 73,884	$ 61	$ 362,262	$ (288,439)