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Unaudited Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity - USD ($) $ in Thousands | Total | Series H redeemable convertible preferred stock | Common Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 | 497,691,757 |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 92,046 |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Accretion of redeemable convertible preferred stock | $ 9,318 |  |  |  |
Issuance of Series redeemable convertible preferred stock for aggregate proceeds, net of issuance costs (in shares) | 34,914,327 |  |  |  |
Issuance of Series redeemable convertible preferred stock for aggregate proceeds, net of issuance costs | $ 3,868 |  |  |  |
Deemed dividend recognized on beneficial conversion features of Series H redeemable convertible preferred stock (Note 8) |  | $ 0 |  |  |
Ending balance (in shares) at Dec. 31, 2018 | 532,606,084 |  |  |  |
Ending balance at Dec. 31, 2018 | $ 105,232 |  |  |  |
Beginning balance (in shares) at Dec. 31, 2017 |  |  | 63,005 |  |
Beginning balance at Dec. 31, 2017 | (96,684) |  | $ 0 | $ 50,954 | $ (147,638)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Accretion of redeemable convertible preferred stock | (9,318) |  |  | (9,318) |
Stock-based compensation | 114 |  |  | 114 |
Issuance of Series redeemable convertible preferred stock for aggregate proceeds of $____ per share, net of issuance costs of $___ (Note 8) | (1,152) |  |  | (1,152) |
Net loss | $ (8,012) |  |  |  | (8,012)
Ending balance (in shares) at Dec. 31, 2018 | 63,005 |  | 63,005 |  |
Ending balance at Dec. 31, 2018 | $ (111,966) |  | $ 0 | 40,598 | (152,564)
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |
Accretion of redeemable convertible preferred stock | $ 4,640 |  |  |  |
Issuance of Series redeemable convertible preferred stock for aggregate proceeds, net of issuance costs (in shares) | 148,928,337 | 233,446,519 |  |  |
Issuance of Series redeemable convertible preferred stock for aggregate proceeds, net of issuance costs | $ 11,492 | $ 3,941 |  |  |
Deemed dividend recognized on beneficial conversion features of Series H redeemable convertible preferred stock (Note 8) | $ 6,741 | $ 6,741 |  |  |
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock (Note 8) (in shares) | 97,592,739 |  |  |  |
Deemed Dividend | $ 6,860 |  |  |  |
Conversion of preferred stock to common stock in connection with initial public offering (in shares) | (1,012,573,679) |  |  |  |
Conversion of preferred stock to common stock in connection with initial public offering | $ (138,906) |  |  |  |
Ending balance (in shares) at Dec. 31, 2019 | 0 |  |  |  |
Ending balance at Dec. 31, 2019 | $ 0 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Accretion of redeemable convertible preferred stock | $ (4,640) |  |  | (4,640) |
Exercise of stock options (in Shares) | 1,548 |  | 1,548 |  |
Exercise of stock options | $ 4 |  |  | 4 |
Stock-based compensation | 572 |  |  | 572 |
Issuance of Series redeemable convertible preferred stock for aggregate proceeds of $____ per share, net of issuance costs of $___ (Note 8) | 6,741 |  |  | 6,741 |
Deemed dividend recognized on beneficial conversion features of Series H redeemable convertible preferred stock | (6,741) |  |  | (6,741) |
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock | (6,860) |  |  | (6,860) |
Stock issued upon conversion of redeemable convertible preferred shares (in shares) |  |  | 7,816,643 |  |
Conversion of preferred stock to common stock in connection with initial public offering (Note 8) | 138,906 |  | $ 8 | 138,898 |
Issuance of common stock in initial public offering, net of underwriting discount, commissions and issuance costs (Note 9) (in shares) |  |  | 4,140,000 |  |
Issuance of common stock in initial public offering, net of underwriting discount, commissions and issuance costs (Note 9) | 50,444 |  | $ 4 | 50,440 |
Net exercise of common stock warrants (in shares) |  |  | 539,794 |  |
Net exercise of common and preferred stock warrants | 511 |  | $ 1 | 510 |
Reclassification of redeemable convertible preferred stock warrant liabilities as equity | 726 |  |  | 726 |
Net loss | $ (12,038) |  |  |  | (12,038)
Ending balance (in shares) at Dec. 31, 2019 | 12,560,990 |  | 12,560,990 |  |
Ending balance at Dec. 31, 2019 | $ 55,659 |  | $ 13 | $ 220,248 | $ (164,602)

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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
Name: | us-gaap_TemporaryEquitySharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant