CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit
Balance at Dec. 31, 2019	$ 53,435	$ 214	$ 96,255	$ (43,034)
Balance (in shares) at Dec. 31, 2019		21,443,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of unrestricted stock		$ 2	(2)
Issuance of unrestricted stock (in shares)		246,000
Shares surrendered by employees to pay taxes related to unrestricted stock	(93)		(93)
Shares surrendered by employees to pay taxes related to unrestricted stock (in shares)		(27,000)
Issuance of common stock under employee stock purchase plan	50		50
Issuance of common stock under employee stock purchase plan (in shares)		15,000
Stock-based compensation expense	838		838
Repurchase of common stock	(946)	$ (2)	(944)
Repurchase of common stock (in shares)		(298,000)
Net loss	(7,614)			(7,614)
Balance at Dec. 31, 2020	$ 45,670	$ 214	96,104	(50,648)
Balance (in shares) at Dec. 31, 2020	21,378,833	21,379,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of unrestricted stock		$ 2	(2)
Issuance of unrestricted stock (in shares)		189,000
Shares surrendered by employees to pay taxes related to unrestricted stock	$ (54)		(54)
Shares surrendered by employees to pay taxes related to unrestricted stock (in shares)		(16,000)
Issuance of common stock under employee stock purchase plan	163		163
Issuance of common stock under employee stock purchase plan (in shares)		62,000
Stock-based compensation expense	1,567		1,567
Net loss	(5,824)			(5,824)
Balance at Dec. 31, 2021	$ 41,522	$ 216	$ 97,778	$ (56,472)
Balance (in shares) at Dec. 31, 2021	21,613,982	21,614,000