CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Allowance for doubtful accounts	$ 174	$ 41
Preferred stock, par value (per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value (per share)	$ 0.001	$ 0.001
Common stock, shares authorized	20,000,000	10,000,000
Common stock, issued	3,663,000	3,613,000
Common Stock, Shares, Outstanding	2,937,000	3,190,000
Treasury stock, shares	726,000	423,000

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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