Organization and Description of Business Initial Public Offering (Details) $ / shares in Units, $ in Thousands				12 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 26, 2019 shares	Sep. 09, 2019	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Subsidiary, Sale of Stock [Line Items]
Shares Sold by Others Outside the Company	2,314,144
Proceeds from Issuance Initial Public Offering | $				$ 60,479	$ 0	$ 0
Stockholders' Equity Note, Stock Split, Conversion Ratio			0.0909
Preferred Stock [Member]
Subsidiary, Sale of Stock [Line Items]
Conversion of Stock, Shares Converted	14,043,977
Common Stock [Member]
Subsidiary, Sale of Stock [Line Items]
Stock Issued During Period, Shares, New Issues				4,873,356
Conversion of Stock, Shares Issued	19,075,167	3,969
Warrant [Member]
Subsidiary, Sale of Stock [Line Items]
Conversion of Stock, Shares Issued	23,512
Warrant [Member] | Series F-1 Preferred [Member]
Subsidiary, Sale of Stock [Line Items]
Conversion of Stock, Shares Converted		9,090
IPO [Member]
Subsidiary, Sale of Stock [Line Items]
Stock Issued During Period, Shares, New Issues	4,873,356
Shares Issued, Price Per Share | $ / shares	$ 15.00
Proceeds from Issuance Initial Public Offering | $	$ 60,500
Payments for Underwriting Expense | $	5,100
Payments of Stock Issuance Costs | $	$ 7,500