Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)		3,770,265	17,543,218
Beginning balance at Dec. 31, 2020	$ 60,751	$ 0	$ 2	$ 414,773	$ (354,024)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred dividends declared	(2,200)			(2,200)
Warrants exercised (in shares)			124,717
Warrants exercised	58			58
Stock option exercised (in shares)			56,923
Stock options exercised	726			726
401(k) employer match (in shares)			4,882
401(k) employer match	251			251
Stock-based compensation expense	2,574			2,574
Net loss	(5,493)				(5,493)
Ending balance (in shares) at Mar. 31, 2021		3,770,265	17,729,740
Ending balance at Mar. 31, 2021	56,667	$ 0	$ 2	416,182	(359,517)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)		3,770,265	17,729,740
Beginning balance (in shares)		3,770,265	20,680,186
Beginning balance at Dec. 31, 2021	45,555	$ 0	$ 2	436,721	(391,168)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred dividends declared	(2,239)			(2,239)
Common stock issued relating to settlement of contingent consideration (in shares)			24,333
Common stock issued relating to settlement of contingent consideration	213			213
Common stock issued for consulting services (in shares)			55,555
Common stock issued for consulting services	102			102
Restricted stock units vested (in shares)			1,259
Restricted stock units vested	(2)			(2)
401(k) employer match (in shares)			69,987
401(k) employer match	188			188
Stock-based compensation expense	2,911			2,911
Net loss	(14,645)				(14,645)
Ending balance (in shares) at Mar. 31, 2022		3,770,265	20,831,320
Ending balance at Mar. 31, 2022	$ 32,083	$ 0	$ 2	$ 437,894	$ (405,813)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)		3,770,265	20,831,320