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Unaudited Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Mar. 31, 2018
Series F redeemable convertible preferred stock |  |  |  |
Sale of temporary equity, price per share (in dollars per share) |  |  |  | $ 0.078
Issuance costs |  |  |  | $ 7
Series G redeemable convertible preferred stock |  |  |  |
Sale of temporary equity, price per share (in dollars per share) |  | $ 0.078 | $ 0.078 |
Issuance costs |  | $ 28 | $ 96 |
Series H redeemable convertible preferred stock |  |  |  |
Sale of temporary equity, price per share (in dollars per share) | $ 0.047 |  |  |
Issuance costs | $ 318 |  |  |

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