Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Oct. 11, 2016	Sep. 30, 2018	Sep. 30, 2017	Oct. 31, 2018	Oct. 02, 2018	Jun. 30, 2018
Class of Warrant or Right [Line Items]
Common stock (in usd per share)		$ 0.01				$ 0.01
Net proceeds from sale of common stock		$ 0	$ (419)
Reclass to capital contributed in excess of par		$ 1,800
Value of non-cash consideration received (in shares)		29,428
IPO
Class of Warrant or Right [Line Items]
Number of securities called by warrants or rights (in shares)	10,000,000
Common stock (in usd per share)	$ 3.00
Gross proceeds from sale of common stock	$ 30,000
Net proceeds from sale of common stock	$ 28,600
Exercise price of warrants or rights (in usd per share)	$ 3.75
Decrease in fair value of warrants exercised		$ 200
Warrants outstanding (in shares)		350,000
Securities purchase agreement | IPO
Class of Warrant or Right [Line Items]
Class of warrant or right, fair value	$ 7,300
Warrant liability
Class of Warrant or Right [Line Items]
Warrants outstanding (in shares)		350,000				450,000
Warrant liability | IPO
Class of Warrant or Right [Line Items]
Options exercised (in shares)		100,000
Subsequent event
Class of Warrant or Right [Line Items]
Common stock (in usd per share)					$ 0.01
Warrants outstanding (in shares)				0