Organization and Description of Business - Additional Information (Details)				1 Months Ended	12 Months Ended
	Jun. 14, 2019 USD ($) $ / shares shares	Sep. 04, 2018 $ / shares shares	Apr. 01, 2018 shares	Apr. 30, 2018 shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Organization And Description Of Business [Line Items]
Operating losses					$ (54,333,000)	$ (29,429,000)
Accumulated deficit					(129,809,000)	(71,020,000)
Cash on hand					30,353,000	$ 20,029,000
Outstanding borrowings from lenders					35,100,000
Available capacity on borrowings					0
Equity financing					$ 102,000,000
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	$ 29,400,000
Series C Holders
Organization And Description Of Business [Line Items]
Shares outstanding | shares			900,000
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			0.3131
Series C Preferred Stock
Organization And Description Of Business [Line Items]
Preferred stock to common stock, conversion ratio			0.2564
Common stock warrants to common stock conversion ratio			0.2564
Common stock, shares issued | shares		1,900,000		5,992,750
Shares issued, price per share | $ / shares		$ 4.00