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Organization and Description of Business - Additional Information (Details) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 14, 2019 USD ($) $ / shares shares | Apr. 01, 2018 shares | Nov. 30, 2018 USD ($) | Apr. 30, 2018 shares | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 31, 2017 USD ($)
Organization And Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating losses |  |  |  |  | $ (6,342,000) | $ (8,410,000) | $ (13,474,000) | $ (17,065,000) | $ 29,400,000 | $ 22,600,000 |
Accumulated deficit |  |  |  |  | (87,034,000) |  | (87,034,000) |  | (71,020,000) | (39,200,000) |
Cash on hand |  |  |  |  | 39,527,000 |  | 39,527,000 |  | 20,029,000 | 5,300,000 |
Outstanding borrowings from lenders |  |  |  |  | 31,900,000 |  | 31,900,000 |  | 27,500,000 | 10,300,000 |
Available capacity on borrowings |  |  |  |  | 1,100,000 |  | 1,100,000 |  | 1,400,000 | $ 5,600,000 |
Equity financing |  |  |  |  | 102,300,000 |  | 102,300,000 |  | 72,600,000 |  |
Repaying of term loan |  |  |  |  |  |  |  | $ 672,000 |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings from lenders |  |  |  |  | $ 15,000,000 |  | $ 15,000,000 |  |  |  |
Credit facility maximum borrowing amount |  |  |  |  |  |  |  |  | 15,000,000 |  |
Term Loan | Midcap |  |  |  |  |  |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility maximum borrowing amount |  |  |  |  |  |  |  |  |  |  | $ 7,000,000
Horizon Term Loan |  |  |  |  |  |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Borrowings from term loan |  |  |  |  |  |  |  |  | 15,000,000 |  |
Repaying of term loan |  |  |  |  |  |  |  |  | $ 4,900,000 |  |
Original Credit Facility | Midcap |  |  |  |  |  |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility maximum borrowing amount |  |  |  |  |  |  |  |  |  |  | $ 30,000,000
Revolving Credit Facility | Midcap |  |  |  |  |  |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Credit facility maximum borrowing amount |  |  | $ 25,000,000 |  |  |  |  |  |  |  |
Additional increase in borrowing amount |  |  | $ 50,000,000 |  |  |  |  |  |  |  |
Initial Public Offering |  |  |  |  |  |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued | shares | 3,600,000 |  |  |  |  |  |  |  |  |  |
Shares issued, price per share | $ / shares | $ 10.00 |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of common stock | $ 29,600,000 |  |  |  |  |  |  |  |  |  |
Series C Holders |  |  |  |  |  |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares outstanding | shares |  | 0.9 |  |  |  |  |  |  |  |  |
All Stock And Warrants Other Than Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, warrants and preferred stock to common stock conversion ratio |  | 3.1939 |  |  |  |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock to common stock, conversion ratio |  | 3.9002 |  |  |  |  |  |  |  |  |
Common stock, shares issued | shares |  |  |  | 5,992,750 |  |  |  |  |  |  |

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