Organization and Description of Business (Details) $ / shares in Units, $ in Thousands		1 Months Ended
	Sep. 28, 2018 USD ($) $ / shares shares	Apr. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) subsidiary	Dec. 31, 2019 USD ($)
Number of subsidiaries | subsidiary			4
Going Concern
Cash, cash equivalents and short-term investments			$ 27,500
Accumulated deficit			$ (149,225)	$ (133,959)
Aggregate gross proceeds of securities purchase agreement		$ 35,000
Initial Public Offering
Shares issued (in shares) | shares	5,000,000
Share price (in dollars per share) | $ / shares	$ 15.00
Proceeds from initial public offering, net of issuance costs paid in the period	$ 65,600
Preferred stock including accrued dividends, converted into common stock | shares	8,084,414