Stockholders’ Equity - Narrative (Details) $ / shares in Units, $ in Thousands		1 Months Ended				6 Months Ended
	Jan. 01, 2020 shares	Jul. 31, 2020 USD ($) shares warrant $ / shares	Jun. 30, 2020 shares	Jan. 31, 2020 $ / shares shares	Jun. 30, 2018 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Proceeds from issuance of common stock and prefunded warrants, gross | $						$ 0	$ 23,598
Options, grants in period (in shares)				1,026,950
Grants in period, weighted average exercise price (in dollars per share) | $ / shares				$ 3.25
Piper Jaffray & Co.
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Maximum amount of common stock eligible to be sold (up to) | $					$ 50,000
2018 Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Number of additional shares authorized (in shares)	929,394		743,515
Restricted Stock Units (RSUs)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
RSUs issued during period (in shares)				156,328
Grant date fair value (in dollars per share) | $ / shares				$ 3.23
Subsequent Event
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Proceeds from issuance of common stock and prefunded warrants, gross | $		$ 60,000
Purchase agreement, aggregate purchase price per unit (in dollars per share) | $ / shares		$ 10.1175
Subsequent Event | Common Units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Shares issued in transaction		5,139,610
Subsequent Event | Prefunded Warrant Units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Warrants exercisable for shares of common stock (in shares)		790,710
Number of warrants per unit sold in purchase agreement | warrant		1
Warrants issued, exercise price (in dollars per share) | $ / shares		$ 0.001
Subsequent Event | Common Stock Warrant
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Warrants issued, exercise price (in dollars per share) | $ / shares		$ 12.74
Warrants outstanding, term		3 years 6 months
Subsequent Event | Common Stock | Common Units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Number of shares of common stock per unit sold in purchase agreement (in shares)		1
Subsequent Event | Common Stock | Prefunded Warrant Units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Number of securities called by each warrant (in shares)		1
Subsequent Event | Common Stock Warrant | Common Units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Purchase agreement, ratio of common stock to warrants		0.3
Subsequent Event | Common Stock Warrant | Prefunded Warrant Units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Purchase agreement, ratio of common stock to prefunded warrants		0.3