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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
CURRENT ASSETS:
Allowance for uncollectible accounts	$ 3,614	$ 3,891
CAPITALIZATION:
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (shares)	70,000,000	70,000,000
Common stock, shares issued (shares)	29,789,887	28,556,605
Common stock, shares outstanding (shares)	29,789,887	28,556,605

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Face amount or stated value per share of common stock.

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