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Organization - (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Sep. 23, 2019	Sep. 30, 2019	Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]
Cash and cash equivalents		$ 77,828	$ 13,164
Accumulated deficit		$ 161,194	$ 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)	$ 14.00
Proceeds from public offering, net	$ 50,500
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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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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