Quarterly report pursuant to Section 13 or 15(d)

Consolidated Condensed Balance Sheets (Parenthetical)

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Consolidated Condensed Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Current assets:    
Allowance for doubtful accounts $ 8 $ 39
Stockholders' equity:    
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 300,000,000 300,000,000
Common stock, shares issued (in shares) 120,506,000 117,160,000
Common stock shares outstanding (in shares) 117,927,000 114,452,000