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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2019 |  | $ 25,525 | $ 2 | [1] | $ 191,769 | $ (166,246)
Balance, shares at Dec. 31, 2019 | [1] |  | 2,043,701 |  |  |
Issuance of common stock upon exercise of stock options |  | 304 |  |  | 304 |
Issuance of common stock upon exercise of stock options, shares | [1] |  | 36,663 |  |  |
Issuance of common stock, net of issuance costs |  | 25,056 |  |  | 25,056 |
Issuance of common stock, net of issuance costs, shares | [1] |  | 3,680 |  |  |
Issuance of common stock, debt repayment |  | 6,170 | $ 1 | [1] | 6,169 |
Issuance of common stock, debt repayment, shares | [1] |  | 822,682 |  |  |
Issuance of common stock upon exercise of ESPP |  | 42 |  |  | 42 |
Issuance of common stock upon exercise of ESPP, shares | [1] |  | 6,426 |  |  |
Net settlement of common stock upon release of RSU |  | (6) |  |  | (6) |
Net settlement of common stock upon release of RSU, shares | [1] |  | 11,319 |  |  |
Employee and nonemployee stock-based compensation |  | 770 |  |  | 770 |
Net loss |  | (23,524) |  |  |  | (23,524)
Balance, at end of period at Sep. 30, 2020 |  | 34,337 | $ 3 | [1] | 224,104 | (189,770)
Balance, shares at Sep. 30, 2020 | [1] |  | 2,924,471 |  |  |
Balance, beginning of period at Jun. 30, 2020 |  | 40,255 | $ 3 | [1] | 223,558 | (183,306)
Balance, shares at Jun. 30, 2020 | [1] |  | 2,916,372 |  |  |
Issuance of common stock upon exercise of stock options |  | 1 |  |  | 1 |
Issuance of common stock upon exercise of stock options, shares | [1] |  | 287 |  |  |
Issuance of common stock, net of issuance costs |  | 64 |  |  | 64 |
Issuance of common stock, debt repayment |  | 169 |  |  | 169 |
Net settlement of common stock upon release of RSU, shares | [1] |  | 7,812 |  |  |
Employee and nonemployee stock-based compensation |  | 312 |  |  | 312 |
Net loss |  | (6,464) |  |  |  | (6,464)
Balance, at end of period at Sep. 30, 2020 |  | 34,337 | $ 3 | [1] | 224,104 | (189,770)
Balance, shares at Sep. 30, 2020 | [1] |  | 2,924,471 |  |  |
Balance, beginning of period at Dec. 31, 2020 |  | 28,410 | $ 7 | [1] | 224,581 | (196,178)
Balance, shares at Dec. 31, 2020 | [1] |  | 6,631,039 |  |  |
Issuance of common stock upon exercise of stock options |  | $ 5 |  |  | 5 |
Issuance of common stock upon exercise of stock options, shares |  | 707 | 707 | [1] |  |
Issuance of common stock, net of issuance costs |  | $ 10,337 | $ 2 | [1] | 10,335 |
Issuance of common stock, net of issuance costs, shares | [1] |  | 2,555,788 |  |  |
Issuance of common stock upon exercise of ESPP |  | 38 |  |  | 38 |
Issuance of common stock upon exercise of ESPP, shares | [1] |  | 9,992 |  |  |
Net settlement of common stock upon release of RSU, shares | [1] |  | 55,683 |  |  |
Employee and nonemployee stock-based compensation |  | 760 |  |  | 760 |
Common stock variance, reverse stock split | [1] |  | 29 |  |  |
Net loss |  | (26,905) |  |  |  | (26,905)
Balance, at end of period at Sep. 30, 2021 |  | 12,645 | $ 9 | [1] | 235,719 | (223,083)
Balance, shares at Sep. 30, 2021 | [1] |  | 9,253,238 |  |  |
Balance, beginning of period at Jun. 30, 2021 |  | 12,962 | $ 7 | [1] | 225,099 | (212,144)
Balance, shares at Jun. 30, 2021 | [1] |  | 6,695,272 |  |  |
Issuance of common stock, net of issuance costs |  | 10,337 | $ 2 | [1] | 10,335 |
Issuance of common stock, net of issuance costs, shares | [1] |  | 2,555,788 |  |  |
Net settlement of common stock upon release of RSU, shares | [1] |  | 2,149 |  |  |
Employee and nonemployee stock-based compensation |  | 285 |  |  | 285 |
Common stock variance, reverse stock split | [1] |  | 29 |  |  |
Net loss |  | (10,939) |  |  |  | (10,939)
Balance, at end of period at Sep. 30, 2021 |  | $ 12,645 | $ 9 | [1] | $ 235,719 | $ (223,083)
Balance, shares at Sep. 30, 2021 | [1] |  | 9,253,238 |  |  |
[1] | Reflects the 1-for-10 reverse stock split that became effective on September 15, 2021. Refer to Note 1 – The Company and its Significant Accounting Policies for further information.

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