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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Allowance for uncollectible accounts	$ 4,600	$ 3,891
Capitalization:
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	70,000,000	70,000,000
Common stock, shares issued (in shares)	30,181,348	28,556,605
Common stock, shares outstanding (in shares)	30,181,348	28,556,605

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