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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Allowance for uncollectible accounts	$ 3,891	$ 1,512
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)	28,556,605	28,456,508
Common stock, shares outstanding (in shares)	28,556,605	28,456,508

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

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