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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets
Allowance for doubtful accounts - trade receivables	$ 58	$ 21
Allowance for doubtful accounts - long-term trade receivables	$ 0	$ 0
Stockholders equity
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, authorized	5,000,000	5,000,000
Preferred stock, issued	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, authorized	50,000,000	50,000,000
Common stock, issued	21,554,053	17,983,177
Common stock, outstanding	21,554,053	17,983,177

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