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CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands | Total | IPO | Common Stock | Common Stock IPO | Additional Paid-in Capital | Additional Paid-in Capital IPO | Accumulated Deficit | Series A Convertible Preferred Stock | Series A-1 Convertible Preferred Stock | Series A-2 Convertible Preferred Stock | Series B Convertible Preferred Stock
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2017 | $ (89,911) |  | $ 1 |  | $ 54,892 |  | $ (144,804) |  |  |  |
Balance, shares at Dec. 31, 2017 |  |  |  |  |  |  |  | 7,471,765 | 1,586,024 | 1,183,703 | 1,665,291
Balance, beginning of period at Dec. 31, 2017 |  |  |  |  |  |  |  | $ 44,564 | $ 4,487 | $ 9,733 | $ 21,613
Balance, shares at Dec. 31, 2017 |  |  | 1,027,113 |  |  |  |  |  |  |  |
Exercise of warrants |  |  |  |  |  |  |  | $ 47 |  |  |
Exercise of warrants, shares |  |  |  |  |  |  |  | 310,676 |  |  |
Dividends declared and paid | (10,152) |  |  |  | (10,152) |  |  |  |  |  |
Dividends declared and paid, shares |  |  |  |  |  |  |  | 944,694 | 66,255 | 49,456 |
Dividends declared and paid |  |  |  |  |  |  |  | $ 9,380 | $ 622 | $ 150 |
Issuance of common stock upon exercise of stock options | $ 17 |  |  |  | 17 |  |  |  |  |  |
Issuance of common stock upon exercise of stock options, shares | 15,475 |  | 15,475 |  |  |  |  |  |  |  |
Reclassification of warrants from liability to preferred stock upon exercise |  |  |  |  |  |  |  | $ 2,951 |  |  |
Recapitalization of convertible preferred stock into common stock | $ 93,547 |  | $ 13 |  | 93,534 |  |  |  |  |  |
Recapitalization of convertible preferred stock into common stock, shares |  |  |  |  |  |  |  | (8,727,135) | (1,652,279) | (1,233,159) | (1,665,291)
Recapitalization of convertible preferred stock into common stock |  |  |  |  |  |  |  | $ (56,942) | $ (5,109) | $ (9,883) | $ (21,613)
Recapitalization of convertible preferred stock into common stock, shares |  |  | 13,277,864 |  |  |  |  |  |  |  |
Reclassification of warrant from liability to equity upon conversion and elimination of preferred stock | 1,804 |  |  |  | 1,804 |  |  |  |  |  |
Issuance of common stock, net of issuance costs | 8,295 |  | $ 1 |  | 8,294 |  |  |  |  |  |
Issuance of common stock, net of issuance costs, shares |  |  | 1,270,905 |  |  |  |  |  |  |  |
Employee and nonemployee stock-based compensation | 252 |  |  |  | 252 |  |  |  |  |  |
Net income (loss) | 1,277 |  |  |  |  |  | 1,277 |  |  |  |
Balance, at end 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 | ASC 606 | 3,115 |  |  |  |  |  | 3,115 |  |  |  |
Exercise of warrants | 23 |  |  |  | 23 |  |  |  |  |  |
Exercise of warrants, shares |  |  | 155,338 |  |  |  |  |  |  |  |
Issuance of common stock upon exercise of stock options | $ 81 |  |  |  | 81 |  |  |  |  |  |
Issuance of common stock upon exercise of stock options, shares | 95,739 |  | 95,739 |  |  |  |  |  |  |  |
Issuance of common stock, net of issuance costs | $ 1,604 | $ 36,850 | $ 1 | $ 4 | 1,603 | $ 36,846 |  |  |  |  |
Issuance of common stock, net of issuance costs, shares |  |  | 228,294 | 4,297,901 |  |  |  |  |  |  |
Issuance of common stock upon ESPP purchase | 146 |  |  |  | 146 |  |  |  |  |  |
Issuance of common stock upon ESPP purchase, shares |  |  | 68,606 |  |  |  |  |  |  |  |
Taxes paid on net issuance of restricted stockaward | (1,897) |  |  |  | (1,897) |  |  |  |  |  |
Employee and nonemployee stock-based compensation | 6,308 |  |  |  | 6,308 |  |  |  |  |  |
Net income (loss) | (25,834) |  |  |  |  |  | (25,834) |  |  |  |
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 |  |  |  |  |  |  |  |

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- Definition The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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