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CONDENSED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Net loss | $ (6,913) | $ (4,497) | $ (18,849) | $ (12,710)
Other comprehensive income: |  |  |  |
Unrealized gain on securities available-for-sale | 26 | 0 | 16 | 0
Total comprehensive loss | (6,887) | (4,497) | (18,833) | (12,710)
Preferred stock dividend payable on Series A Convertible Preferred Stock | (6) | (6) | (18) | (18)
Comprehensive loss attributable to common stockholders | (6,893) | (4,503) | (18,851) | (15,995)
Series D Convertible Preferred Stock |  |  |  |
Other comprehensive income: |  |  |  |
Deemed dividend recognized for beneficial conversion features of Convertible Preferred Stock issuance | 0 | 0 | 0 | (602)
Series E Convertible Preferred Stock |  |  |  |
Other comprehensive income: |  |  |  |
Deemed dividend recognized for beneficial conversion features of Convertible Preferred Stock issuance | $ 0 | $ 0 | $ 0 | $ (2,665)

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