Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Allowance for doubtful accounts	$ 0	$ 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)	120,926,000	117,160,000
Common stock shares outstanding (in shares)	118,453,000	114,452,000