Organization and Description of Business - Narrative (Details)				3 Months Ended		6 Months Ended
	Mar. 06, 2020 USD ($)	Feb. 14, 2019 USD ($) $ / shares shares	Feb. 01, 2019	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) shares	Jun. 30, 2020 shares	Dec. 31, 2019 shares
Subsidiary Sale Of Stock [Line Items]
Initial public offering, net of issuance costs | $				$ (34,000)	$ 77,155,000
Common stock, shares authorized (shares)						150,000,000	150,000,000
Preferred stock, shares authorized (shares)						10,000,000	10,000,000
Reverse stock split			0.1615
Shelf registration, maximum amount | $	$ 300,000,000.0
Initial Public Offering (IPO)
Subsidiary Sale Of Stock [Line Items]
Shares sold during initial public offering (shares)		5,750,000
Share price (USD per share) | $ / shares		$ 15.00
ATM Program
Subsidiary Sale Of Stock [Line Items]
Common stock, maximum offering amount | $	$ 75,000,000.0
Initial public offering, net of issuance costs (in shares)						0
Additional Paid-in Capital
Subsidiary Sale Of Stock [Line Items]
Initial public offering, net of issuance costs | $				$ (34,000)	$ 77,155,000
Additional Paid-in Capital | Initial Public Offering (IPO)
Subsidiary Sale Of Stock [Line Items]
Initial public offering, net of issuance costs | $		$ 77,100,000
Common Stock
Subsidiary Sale Of Stock [Line Items]
Initial public offering, net of issuance costs (in shares)					5,750,000
Common Stock | Initial Public Offering (IPO)
Subsidiary Sale Of Stock [Line Items]
Conversion of shares upon IPO (shares)		17,275,299