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v3.20.1

Unaudited Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | ---
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 |  |
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)
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |
Accretion of redeemable convertible preferred stock | $ 0 |  |  |
Beginning balance (in shares) at Dec. 31, 2019 | 12,560,990 | 12,560,990 |  |
Beginning balance at Dec. 31, 2019 | $ 55,659 | $ 13 | 220,248 | (164,602)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Exercise of stock options (in shares) | 43,700 | 43,700 |  |
Exercise of stock options | $ 10 |  | 10 |
Stock-based compensation | 431 |  | 431 |
Net exercise of common stock warrants (in shares) |  | 22,366 |  |
Net exercise of common stock warrants | 0 |  |  |
Net loss | $ (5,563) |  |  | (5,563)
Ending balance (in shares) at Mar. 31, 2020 | 12,627,056 | 12,627,056 |  |
Ending balance at Mar. 31, 2020 | $ 50,537 | $ 13 | $ 220,689 | $ (170,165)

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