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Redeemable Convertible Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 23, 2019 | Jan. 31, 2018 | Jul. 31, 2019 | May 31, 2019 | Mar. 31, 2019 | Jan. 31, 2019 | Jan. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Mar. 31, 2019 | Jan. 02, 2019 | Jan. 01, 2019
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) |  |  | 1,038,667,059 |  |  |  |  |  |  | 955,500,000 |  |  |  |  |  |  | 955,500,000 | 750,300,000
Temporary Equity, Shares Redeemed upon Conversion |  |  |  |  |  |  |  |  | 1,012,573,679 |  |  |  |  |  |  |  |  |
Deemed Dividend |  |  |  |  |  |  |  |  | $ 6,860 |  |  |  |  |  |  |  |  |
Beneficial conversion feature, temporary equity |  |  |  |  |  |  |  |  | $ 6,741 |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued upon conversion of redeemable convertible preferred shares (in shares) |  |  |  |  |  |  |  |  | 7,816,643 |  |  |  |  |  |  |  |  |
Common Stock | IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued upon conversion of redeemable convertible preferred shares (in shares) | 7,816,643 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series G redeemable convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 205,200,000 |
Number of shares sold, temporary equity |  |  |  | 51,282,048 | 9,615,384 | 88,030,905 |  |  |  |  |  |  |  |  |  |  |  |
Sale of temporary equity, price per share (in dollars per share) |  |  |  |  |  | $ 0.078 |  |  |  | $ 0.078 | $ 0.078 |  |  |  |  |  |  |
Proceeds from sale of temporary equity |  |  |  | $ 4,000 |  |  |  |  |  |  |  |  |  |  | $ 3,750 | $ 7,600 |  |
Deemed dividend from conversion of Series G to Series H redeemable convertible preferred stock (Note 8) |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,860 | $ 0 |  |  |  |
Right to require mandatory purchase, temporary equity |  |  |  | 32,051,280 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration to be received under mandatory purchase, temporary equity |  |  |  | $ 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity, Shares Redeemed upon Conversion |  |  | 148,928,337 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series F redeemable convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold, temporary equity |  | 34,914,327 |  |  |  |  |  | 54,246,756 |  |  |  |  |  |  |  |  |  |
Sale of temporary equity, price per share (in dollars per share) |  |  |  |  |  |  | $ 0.078 | $ 0.078 |  |  |  | $ 0.078 |  |  |  |  |  |
Proceeds from sale of temporary equity |  | $ 2,700 |  |  |  |  |  | $ 4,200 |  |  |  |  |  |  |  |  |  |
Deemed Dividend |  |  |  |  |  |  |  |  |  |  |  | $ 1,200 |  |  |  |  |  |
Series H redeemable convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized (in shares) |  |  | 479,967,595 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold, temporary equity |  |  | 233,446,519 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of temporary equity, price per share (in dollars per share) |  |  | $ 0.04712 |  |  |  |  |  | $ 0.047 |  |  |  |  |  |  |  |  |
Proceeds from sale of temporary equity |  |  | $ 11,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued upon conversion, temporary equity (in shares) |  |  | 246,521,076 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial conversion feature, temporary equity |  |  |  |  |  |  |  |  | $ 6,700 |  |  |  | $ 6,741 | $ 0 |  |  |  |

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