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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
CONDENSED CONSOLIDATED BALANCE SHEETS    
Accounts receivable, allowances $ 526 $ 610
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, authorized (in shares) 50,000,000 50,000,000
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, authorized (in shares) 500,000,000 500,000,000
Common stock, issued (in shares) 84,016,147 83,754,449
Common stock, outstanding (in shares) 84,016,147 83,754,449