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Common Stock
6 Months Ended
Jun. 30, 2021
Equity [Abstract]  
Common Stock

7. Common stock

As of June 30, 2021 and December 31, 2020, the number of issued and outstanding shares of common stock was 12,248,794 and 12,167,327, respectively. The change in the number of issued and outstanding shares of common stock was due to an aggregate of 81,467 shares of common stock issued as a result of the vesting of RSUs.