CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Total
Balance at Dec. 31, 2017	$ 215	$ 96,246	$ (35,927)	$ 60,534
Balance (in shares) at Dec. 31, 2017	21,493,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under employee stock purchase plan		50		50
Issuance of common stock under employee stock purchase plan (in shares)	14,000
Issuance of unrestricted stock	$ 1	(1)
Issuance of unrestricted stock (in shares)	136,000
Shares surrendered by employees to pay taxes related to unrestricted stock		(107)		(107)
Shares surrendered by employees to pay taxes related to unrestricted stock (in shares)	(25,000)
Stock-based compensation expense		580		580
Repurchase of common stock	$ (1)	(392)		(393)
Repurchase of common stock (in shares)	(102,000)
Net income (loss)			1,233	1,233
Balance at Dec. 31, 2018	$ 215	96,376	(34,694)	$ 61,897
Balance (in shares) at Dec. 31, 2018	21,516,000			21,515,872
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options (in shares)	4,000
Performance share award (in shares)	30,000
Issuance of common stock under employee stock purchase plan		43		$ 43
Issuance of common stock under employee stock purchase plan (in shares)	14,000
Issuance of unrestricted stock	$ 1	(1)
Issuance of unrestricted stock (in shares)	140,000
Shares surrendered by employees to pay taxes related to unrestricted stock		(92)		(92)
Shares surrendered by employees to pay taxes related to unrestricted stock (in shares)	(27,000)
Stock-based compensation expense		692		692
Repurchase of common stock	$ (2)	(763)		(765)
Repurchase of common stock (in shares)	(234,000)
Net income (loss)			(8,340)	(8,340)
Balance at Dec. 31, 2019	$ 214	$ 96,255	$ (43,034)	$ 53,435
Balance (in shares) at Dec. 31, 2019	21,443,000			21,442,781