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Organization - (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Sep. 23, 2019 USD ($) $ / shares shares	Sep. 06, 2019	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)
Subsidiary, Sale of Stock [Line Items]
Reverse stock split ratio, common stock		0.0054
Cash and cash equivalents | $			$ 72,084	$ 13,164
Accumulated deficit | $			$ 164,602	$ 152,564
Common Stock
Subsidiary, Sale of Stock [Line Items]
Stock issued upon conversion of redeemable convertible preferred shares (in shares)			7,816,643
Common Stock | IPO
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in public offering	4,140,000
Shares issued in public offering, price per share (in dollars per share) | $ / shares	$ 14.00
Proceeds from public offering, net | $	$ 50,400
Stock issued upon conversion of redeemable convertible preferred shares (in shares)	7,816,643
Common Stock | Over-Allotment Option
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in public offering	540,000

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