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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands | Total | IPO | Common Stock | Common Stock IPO | Additional Paid-in Capital | Additional Paid-in Capital IPO | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2018 | $ 5,129 |  | $ 15 |  | $ 148,641 |  | $ (143,527)
Balance, shares at Dec. 31, 2018 |  |  | 15,591,357 |  |  |  |
Beginning balance adjustment – impact of ASC 606 | 3,115 |  |  |  |  |  | 3,115
Issuance of common stock, net of issuance costs | 1,604 | $ 36,849 | $ 1 | $ 4 | 1,603 | $ 36,845 |
Issuance of common stock, net of issuance costs, shares |  |  | 227,628 | 4,297,901 |  |  |
Issuance of common stock upon exercise of stock options | 55 |  |  |  | 55 |  |
Issuance of common stock upon exercise of stock options, shares |  |  | 72,034 |  |  |  |
Exercise of warrants | 23 |  |  |  | 23 |  |
Exercise of warrants, shares |  |  | 155,338 |  |  |  |
Taxes paid on RSA | (1,897) |  |  |  | (1,897) |  |
Employee and nonemployee stock-based compensation | 5,604 |  |  |  | 5,604 |  |
Net loss | (10,723) |  |  |  |  |  | (10,723)
Balance, at end of period at Jun. 30, 2019 | 39,759 |  | $ 20 |  | 190,874 |  | (151,135)
Balance, shares at Jun. 30, 2019 |  |  | 20,344,258 |  |  |  |
Balance, beginning of period at Dec. 31, 2018 | 5,129 |  | $ 15 |  | 148,641 |  | (143,527)
Balance, shares at Dec. 31, 2018 |  |  | 15,591,357 |  |  |  |
Balance, at end of period at Dec. 31, 2019 | 25,525 |  | $ 20 |  | 191,751 |  | (166,246)
Balance, shares at Dec. 31, 2019 |  |  | 20,437,235 |  |  |  |
Balance, beginning of period at Mar. 31, 2019 | 4,812 |  | $ 16 |  | 150,322 |  | (145,536)
Balance, shares at Mar. 31, 2019 |  |  | 15,873,705 |  |  |  |
Issuance of common stock, net of issuance costs |  | $ 36,849 |  | $ 4 |  | $ 36,845 |
Issuance of common stock, net of issuance costs, shares |  |  |  | 4,077,143 |  |  |
Net issuance of restricted stock award (RSA), shares |  |  | 220,758 |  |  |  |
Issuance of common stock upon exercise of stock options | 14 |  |  |  | 14 |  |
Issuance of common stock upon exercise of stock options, shares |  |  | 17,314 |  |  |  |
Exercise of warrants | 23 |  |  |  | 23 |  |
Exercise of warrants, shares |  |  | 155,338 |  |  |  |
Taxes paid on RSA | (1,897) |  |  |  | (1,897) |  |
Employee and nonemployee stock-based compensation | 5,557 |  |  |  | 5,557 |  |
Net loss | (5,599) |  |  |  |  |  | (5,599)
Balance, at end of period at Jun. 30, 2019 | 39,759 |  | $ 20 |  | 190,874 |  | (151,135)
Balance, shares at Jun. 30, 2019 |  |  | 20,344,258 |  |  |  |
Balance, beginning of period at Dec. 31, 2019 | 25,525 |  | $ 20 |  | 191,751 |  | (166,246)
Balance, shares at Dec. 31, 2019 |  |  | 20,437,235 |  |  |  |
Issuance of common stock, net of issuance costs | 24,992 |  | $ 37 |  | 24,955 |  |
Issuance of common stock, net of issuance costs, shares |  |  | 36,800,000 |  |  |  |
Issuance of common stock, debt repayment | 6,001 |  | $ 8 |  | 5,993 |  |
Issuance of common stock, debt repayment, shares |  |  | 8,226,834 |  |  |  |
Issuance of common stock upon exercise of stock options | $ 303 |  | $ 1 |  | 302 |  |
Issuance of common stock upon exercise of stock options, shares | 363,857 |  | 363,857 |  |  |  |
Issuance of common stock upon exercise of ESPP | $ 42 |  |  |  | 42 |  |
Issuance of common stock upon exercise of ESPP, shares |  |  | 64,320 |  |  |  |
Net settlement of common stock upon release of RSU | (6) |  |  |  | (6) |  |
Net settlement of common stock upon release of RSU, shares |  |  | 35,070 |  |  |  |
Employee and nonemployee stock-based compensation | 458 |  |  |  | 458 |  |
Net loss | (17,060) |  |  |  |  |  | (17,060)
Balance, at end of period at Jun. 30, 2020 | 40,255 |  | $ 66 |  | 223,495 |  | (183,306)
Balance, shares at Jun. 30, 2020 |  |  | 65,927,316 |  |  |  |
Balance, beginning of period at Mar. 31, 2020 | 15,994 |  | $ 21 |  | 192,183 |  | (176,210)
Balance, shares at Mar. 31, 2020 |  |  | 20,677,360 |  |  |  |
Issuance of common stock, net of issuance costs | 24,992 |  | $ 37 |  | 24,955 |  |
Issuance of common stock, net of issuance costs, shares |  |  | 36,800,000 |  |  |  |
Issuance of common stock, debt repayment | 6,001 |  | $ 8 |  | 5,993 |  |
Issuance of common stock, debt repayment, shares |  |  | 8,226,834 |  |  |  |
Issuance of common stock upon exercise of stock options | 93 |  |  |  | 93 |  |
Issuance of common stock upon exercise of stock options, shares |  |  | 119,942 |  |  |  |
Issuance of common stock upon exercise of ESPP | 42 |  |  |  | 42 |  |
Issuance of common stock upon exercise of ESPP, shares |  |  | 68,110 |  |  |  |
Net settlement of common stock upon release of RSU | (6) |  |  |  | (6) |  |
Net settlement of common stock upon release of RSU, shares |  |  | 35,070 |  |  |  |
Employee and nonemployee stock-based compensation | 235 |  |  |  | 235 |  |
Net loss | (7,096) |  |  |  |  |  | (7,096)
Balance, at end of period at Jun. 30, 2020 | $ 40,255 |  | $ 66 |  | $ 223,495 |  | $ (183,306)
Balance, shares at Jun. 30, 2020 |  |  | 65,927,316 |  |  |  |

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