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Organization and Business Description - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 16, 2017 | Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2018
Organization And Business Description [Line Items] |  |  |  |
State of incorporation |  | DE |  |
Date of incorporation |  | Jun. 26, 2015 |  |
Issuance of stock, net of issuance/offering costs |  |  | $ 43,240 |
Net proceeds received after deducting underwriting discounts and commissions and offering costs |  |  | $ 47,690 |
Conversion of convertible securities into shares of common stock | 9,091,484 |  |  |
Preferred stock, shares outstanding | 0 | 0 |  | 0
Class A Common Stock |  |  |  |
Organization And Business Description [Line Items] |  |  |  |
Conversion of convertible securities into shares of common stock | 60,564,678 |  |  |
Class A Common Stock | Selling Shareholders |  |  |  |
Organization And Business Description [Line Items] |  |  |  |
Issuance of stock, net of issuance/offering costs, Shares | 7,605,000 |  |  |
Class A Common Stock | Subsequent Conversion |  |  |  |
Organization And Business Description [Line Items] |  |  |  |
Conversion of convertible securities into shares of common stock | 40,376,452 |  |  |
Class B Common Stock |  |  |  |
Organization And Business Description [Line Items] |  |  |  |
Conversion of convertible securities into shares of common stock | 40,376,452 |  |  |
IPO |  |  |  |
Organization And Business Description [Line Items] |  |  |  |
Preferred stock, shares outstanding | 0 |  |  |
IPO | Class A Common Stock |  |  |  |
Organization And Business Description [Line Items] |  |  |  |
Issuance of stock, net of issuance/offering costs, Shares | 3,205,000 |  |  |
Number of shares issued for services | 705,000 |  |  |
Offering price per share | $ 16.00 |  |  |
Issuance of stock, net of issuance/offering costs | $ 51,300 |  |  |
Net proceeds received after deducting underwriting discounts and commissions and offering costs | 43,200 |  |  |
Underwriting discounts and commissions | 3,600 |  |  |
Stock issuance costs | $ 4,500 |  |  |
Conversion of convertible securities into shares of common stock | 20,188,226 |  |  |
IPO | Convertible Preferred Stock |  |  |  |
Organization And Business Description [Line Items] |  |  |  |
Preferred stock, shares outstanding | 0 |  |  |

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