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Unaudited Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity - USD ($) $ in Thousands | Total | 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 | $ 1,382 |  |  |
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs (in shares) | 34,914,327 |  |  |
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs | $ 3,868 |  |  |
Ending balance (in shares) at Mar. 31, 2018 | 532,606,084 |  |  |
Ending balance at Mar. 31, 2018 | $ 97,296 |  |  |
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 | 1,382 |  | 1,382 |
Stock-based compensation | 46 |  | 46 |
Issuance of Series H redeemable convertible preferred stock for aggregate proceeds of $0.047 per share, net of issuance costs of $318 (Note 8) | (1,152) |  | (1,152) |
Net loss | (2,793) |  |  | (2,793)
Ending balance (in shares) at Mar. 31, 2018 |  | 63,005 |  |
Ending balance at Mar. 31, 2018 | $ (98,879) | $ 0 | 48,466 | (147,345)
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 | $ 6,462 |  |  |
Ending balance (in shares) at Sep. 30, 2018 | 532,606,084 |  |  |
Ending balance at Sep. 30, 2018 | $ 102,376 |  |  |
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] |  |  |  |
Net loss | (6,695) |  |  |
Ending balance (in shares) at Sep. 30, 2018 |  | 63,005 |  |
Ending balance at Sep. 30, 2018 | $ (107,807) | $ 0 | 43,440 | (151,247)
Beginning balance (in shares) at Mar. 31, 2018 | 532,606,084 |  |  |
Beginning balance at Mar. 31, 2018 | $ 97,296 |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Accretion of redeemable convertible preferred stock | $ 2,312 |  |  |
Ending balance (in shares) at Jun. 30, 2018 | 532,606,084 |  |  |
Ending balance at Jun. 30, 2018 | $ 99,608 |  |  |
Beginning balance (in shares) at Mar. 31, 2018 |  | 63,005 |  |
Beginning balance at Mar. 31, 2018 | (98,879) | $ 0 | 48,466 | (147,345)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Accretion of redeemable convertible preferred stock | 2,312 |  | 2,312 |
Stock-based compensation | 44 |  | 44 |
Net loss | (2,146) |  |  | (2,146)
Ending balance (in shares) at Jun. 30, 2018 |  | 63,005 |  |
Ending balance at Jun. 30, 2018 | (103,293) | $ 0 | 46,198 | (149,491)
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Accretion of redeemable convertible preferred stock | $ 2,768 |  |  |
Ending balance (in shares) at Sep. 30, 2018 | 532,606,084 |  |  |
Ending balance at Sep. 30, 2018 | $ 102,376 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Accretion of redeemable convertible preferred stock | 2,768 |  | 2,768 |
Stock-based compensation | 10 |  | 10 |
Net loss | (1,756) |  |  | (1,756)
Ending balance (in shares) at Sep. 30, 2018 |  | 63,005 |  |
Ending balance at Sep. 30, 2018 | $ (107,807) | $ 0 | 43,440 | (151,247)
Beginning balance (in shares) at Dec. 31, 2018 | 532,606,084 |  |  |
Beginning balance at Dec. 31, 2018 | $ 105,232 |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Accretion of redeemable convertible preferred stock | $ 2,114 |  |  |
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs (in shares) | 97,646,289 |  |  |
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs | $ 7,520 |  |  |
Ending balance (in shares) at Mar. 31, 2019 | 630,252,373 |  |  |
Ending balance at Mar. 31, 2019 | $ 114,866 |  |  |
Beginning balance (in shares) at Dec. 31, 2018 | 63,005 | 63,005 |  |
Beginning balance at Dec. 31, 2018 | $ (111,966) | $ 0 | 40,598 | (152,564)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Accretion of redeemable convertible preferred stock | 2,114 |  | 2,114 |
Exercise of stock options (in Shares) |  | 24 |  |
Exercise of stock options | 0 | $ 0 |  |
Stock-based compensation | 12 |  | 12 |
Net loss | (2,704) |  |  | (2,704)
Ending balance (in shares) at Mar. 31, 2019 |  | 63,029 |  |
Ending balance at Mar. 31, 2019 | $ (116,772) | $ 0 | 38,496 | (155,268)
Beginning balance (in shares) at Dec. 31, 2018 | 532,606,084 |  |  |
Beginning balance at Dec. 31, 2018 | $ 105,232 |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Accretion of redeemable convertible preferred stock | $ 4,640 |  |  |
Ending balance (in shares) at Sep. 30, 2019 | 0 |  |  |
Ending balance at Sep. 30, 2019 | $ 0 |  |  |
Beginning balance (in shares) at Dec. 31, 2018 | 63,005 | 63,005 |  |
Beginning balance at Dec. 31, 2018 | $ (111,966) | $ 0 | 40,598 | (152,564)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Exercise of stock options (in Shares) | 50 |  |  |
Net loss | $ (8,630) |  |  |
Ending balance (in shares) at Sep. 30, 2019 | 12,559,492 | 12,559,492 |  |
Ending balance at Sep. 30, 2019 | $ 58,650 | $ 13 | 219,831 | (161,194)
Beginning balance (in shares) at Mar. 31, 2019 | 630,252,373 |  |  |
Beginning balance at Mar. 31, 2019 | $ 114,866 |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Accretion of redeemable convertible preferred stock | $ 2,188 |  |  |
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs (in shares) | 51,282,048 |  |  |
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs | $ 3,972 |  |  |
Ending balance (in shares) at Jun. 30, 2019 | 681,534,421 |  |  |
Ending balance at Jun. 30, 2019 | $ 121,026 |  |  |
Beginning balance (in shares) at Mar. 31, 2019 |  | 63,029 |  |
Beginning balance at Mar. 31, 2019 | (116,772) | $ 0 | 38,496 | (155,268)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Accretion of redeemable convertible preferred stock | 2,188 |  | 2,188 |
Exercise of stock options (in Shares) |  | 26 |  |
Exercise of stock options | 0 | $ 0 |  |
Stock-based compensation | 11 |  | 11 |
Net loss | (2,785) |  |  | (2,785)
Ending balance (in shares) at Jun. 30, 2019 |  | 63,055 |  |
Ending balance at Jun. 30, 2019 | (121,734) | $ 0 | 36,319 | (158,053)
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Accretion of redeemable convertible preferred stock | $ 338 |  |  |
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs (in shares) | 233,446,519 |  |  |
Issuance of Series G redeemable convertible preferred stock for aggregate proceeds, net of issuance costs | $ 3,941 |  |  |
Deemed dividend recognized on beneficial conversion features of Series H redeemable convertible preferred stock (Note 8) | $ 6,741 |  |  |
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock (Note 8) (in shares) | 97,592,739 |  |  |
Conversion of preferred stock to common stock in connection with initial public offering (Note 8) (in shares) | 1,012,573,679 |  |  |
Conversion of preferred stock to common stock in connection with initial public offering (Note 8) | $ 138,906 |  |  |
Ending balance (in shares) at Sep. 30, 2019 | 0 |  |  |
Ending balance at Sep. 30, 2019 | $ 0 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Accretion of redeemable convertible preferred stock | 338 |  | 338 |
Stock-based compensation | 62 |  | 62 |
Issuance of Series H redeemable convertible preferred stock for aggregate proceeds of $0.047 per share, net of issuance costs of $318 (Note 8) | 6,741 |  | 6,741 |
Deemed dividend recognized on beneficial conversion features of Series H redeemable convertible preferred stock (Note 8) | 6,741 |  | 6,741 |
Deemed Dividend | 6,860 |  |  |
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock (Note 8) | 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) | 50,518 | $ 4 | 50,514 |
Net exercise of common stock warrants (in shares) |  | 539,794 |  |
Net exercise of common stock warrants | 511 | $ 1 | 510 |
Reclassification of redeemable convertible preferred stock warrant liabilities as equity | 726 |  | 726 |
Net loss | $ (3,141) |  |  | (3,141)
Ending balance (in shares) at Sep. 30, 2019 | 12,559,492 | 12,559,492 |  |
Ending balance at Sep. 30, 2019 | $ 58,650 | $ 13 | $ 219,831 | $ (161,194)

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- Definition Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Value of stock issued as a result of the exercise of stock options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: 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(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Value of accretion of temporary equity to its redemption value during the period. + References No definition available. + Details
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- Definition Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. 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. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References No definition available. + Details
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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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