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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
shares in Thousands, $ in Thousands
Sep. 30, 2021
Dec. 31, 2020
CONDENSED CONSOLIDATED BALANCE SHEETS    
Accounts receivables and contract assets, allowances $ 43 $ 368
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 10,000 10,000
Preferred stock, shares issued 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 100,000 100,000
Common stock, shares issued 49,362 48,297
Common stock, shares outstanding 48,952 48,189
Treasury stock, shares 410 108