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Preferred Stock (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) $ / shares shares | Nov. 05, 2018 USD ($) $ / shares shares | Nov. 02, 2018 USD ($) | Apr. 05, 2018 USD ($) $ / shares shares | Nov. 30, 2018 USD ($) $ / shares shares | Apr. 30, 2018 USD ($) $ / shares shares | Jan. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) item $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | May 13, 2019 $ / shares shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, number of shares authorized | 0 |  |  |  |  |  |  |  |  | 0 |  | 10,000,000 | 10,000,000
Preferred stock, par value per share | $ / shares | $ 0.001 |  |  |  |  |  |  |  |  | $ 0.001 |  | $ 0.001 | $ 0.001
Preferred stock, shares issued | 0 |  |  |  |  |  |  |  |  | 0 |  | 0 |
Preferred stock, shares outstanding | 0 |  |  |  |  |  |  |  |  | 0 |  | 0 | 0
Preferred stock; par value of $0.001 per share, 10,000,000 and 0 shares authorized at June 30, 2019 and December 31, 2018. No shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively | $ |  |  |  |  |  |  |  |  |  |  |  |  |
Noncumulative dividends, annual rate |  |  |  |  |  |  |  |  |  | 8.00% |  |  |
Dividends declared | $ / shares |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
Conversion ratio |  |  |  |  |  |  |  |  |  | 0.1245 |  |  |
Minimum gross proceeds for mandatorily convertible preferred stock | $ |  |  |  |  |  |  |  |  |  | $ 75,000 |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  |  | $ 15,000 |  |  |  |  |  | $ 31,000 | $ 122,223 | $ 25,000 |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, number of shares authorized | 68,181,819 |  |  |  |  |  |  |  |  | 68,181,819 | 64,545,455 | 0 |
Preferred stock, par value per share | $ / shares | $ 0.001 |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |
Preferred stock, shares issued | 68,181,819 |  |  |  |  |  |  |  |  | 68,181,819 | 40,000,000 | 0 |
Preferred stock, shares outstanding | 68,181,819 |  |  |  |  |  |  |  |  | 68,181,819 | 40,000,000 | 0 |
Stock issued | 68,181,819 |  |  |  |  |  |  |  |  |  |  |  |
Number of directors, stock holders are entitled to elect | item |  |  |  |  |  |  |  |  |  | 5 |  |  |
Series A-1 Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 1.00 |  |  |  |  |
Liquidation preference per share | $ / shares | $ 8.03 |  |  |  |  |  |  |  |  | $ 8.03 |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  |  |  |  |  |  |  | $ 15,000 |  |  |  |  |
Series A-2 preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |
Series A-3 preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued |  |  |  | 28,181,819 |  | 28,181,819 |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  | $ 1.10 |  | $ 1.10 |  |  |  |  |  |  |
Liquidation preference per share | $ / shares | $ 8.84 |  |  |  |  |  |  |  |  | $ 8.84 |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  |  |  | $ 31,000 |  | $ 31,000 |  |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, number of shares authorized | 56,828,852 |  |  |  |  |  |  |  |  | 56,828,852 | 0 | 0 |
Preferred stock, par value per share | $ / shares | $ 0.001 |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |
Preferred stock, shares issued | 56,828,851 |  |  |  |  |  |  |  |  | 56,828,851 | 0 | 0 |
Preferred stock, shares outstanding | 56,828,851 |  |  |  |  |  |  |  |  | 56,828,851 | 0 | 0 |
Stock issued | 56,828,851 |  |  |  |  |  |  |  |  |  |  |  |
Number of directors, stock holders are entitled to elect | item |  |  |  |  |  |  |  |  |  | 2 |  |  |
Series B-1 preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued |  | 15,052,117 |  |  | 15,052,117 |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  | $ 1.59 |  |  |  |  |  |  |  |  |  |  |
Series B-2 preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued |  | 34,276,734 |  |  | 34,276,734 |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  | $ 1.59 |  |  |  |  |  |  |  |  |  |  |
Series B-1 and B-2 preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  | $ 1.59 |  |  |  |  |  |  |  |
Liquidation preference per share | $ / shares | $ 12.77 |  |  |  |  |  |  |  |  | $ 12.77 |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  |  |  |  | $ 78,400 |  |  |  |  |  |  |  |
Series B-3 preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued |  | 7,500,000 |  |  | 7,500,000 |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  | $ 2.00 |  |  | $ 2.00 |  |  |  |  |  |  |  |
Preferred stock; par value of $0.001 per share, 10,000,000 and 0 shares authorized at June 30, 2019 and December 31, 2018. No shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively | $ |  |  |  |  | $ 13,300 |  |  |  |  |  |  |  |
Premium over the fair value | $ |  |  |  |  | 1,700 |  |  |  |  |  |  |  |
Liquidation preference per share | $ / shares | $ 16.07 |  |  |  |  |  |  |  |  | $ 16.07 |  |  |
Proceeds from Issuance of Preferred Stock and Preference Stock | $ |  | $ 93,400 |  |  | $ 15,000 |  |  |  |  |  |  |  |

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