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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Allowance for doubtful accounts	$ 445	$ 533
Inventory reserves	$ 40	$ 66
Stockholders' Equity Attributable to Parent [Abstract]
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	96,000,000	96,000,000
Common stock, shares issued (in shares)	49,852,000	49,671,000
Common stock, shares outstanding (in shares)	49,852,000	49,671,000

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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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Amount of valuation reserve for inventory.

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