Risks and Liquidity (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended
	Jun. 30, 2020	Nov. 30, 2019	Dec. 31, 2019
Unusual Risk or Uncertainty [Line Items]
Accumulated deficit	$ (181,160)		$ (167,859)
Received net proceeds of after deducting underwriting discounts, commissions and other offering expenses		$ 50,600
IPO
Unusual Risk or Uncertainty [Line Items]
Stock Issued During Period, Shares, New Issues		4,398,700
Shares Issued, Price Per Share		$ 13.00
Over-Allotment Option
Unusual Risk or Uncertainty [Line Items]
Stock Issued During Period, Shares, New Issues		398,700
Second Underwritten Public Offering [Member]
Unusual Risk or Uncertainty [Line Items]
Stock Issued During Period, Shares, New Issues	3,000,000
Shares Issued, Price Per Share	$ 16.00
Received net proceeds of after deducting underwriting discounts, commissions and other offering expenses	$ 44,700