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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Allowance for uncollectible accounts	$ 272	$ 190
Capitalization:
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	36,000,000	36,000,000
Common stock, shares issued	28,404,316	20,520,856
Common stock, shares outstanding	28,404,316	20,520,856

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- Definition

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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