Stockholders' Equity (Narrative) (Details) $ / shares in Units, $ in Millions							3 Months Ended			6 Months Ended
	Jan. 22, 2020 shares	Dec. 24, 2019 USD ($) $ / shares shares	May 07, 2019 USD ($) $ / shares shares	May 03, 2019 USD ($) shares	Dec. 12, 2018 USD ($) shares	Oct. 02, 2018	Jun. 30, 2020 shares	Mar. 31, 2020 shares	Jun. 30, 2019 shares	Jun. 30, 2020 shares	Jun. 30, 2019 shares
Subsidiary, Sale of Stock [Line Items]
Total common shares reserved for future issuance (in shares)							76,903,000			76,903,000
Reverse stock split ratio						0.0833
Convertible preferred stock converted into common stock (in shares)										1,327,127
Warrants exercised							0		0	0	0
Private Placement
Subsidiary, Sale of Stock [Line Items]
Share sold (in shares)				9,730,534
Warrants callable			9,730,534
Sale of stock price (usd per share) | $ / shares			$ 1.205
Consideration received | $				$ 16.7
Shares issued upon conversion (in shares)			10
Warrants, term			5 years
Warrant exercise price (usd per share) | $ / shares			$ 1.08
Milestone Closing
Subsidiary, Sale of Stock [Line Items]
Consideration received | $		$ 24.6
At The Moment
Subsidiary, Sale of Stock [Line Items]
Share sold (in shares)					1,903,880
Consideration received | $					$ 2.1
Commission fee rate					3.00%
Shares issued (in shares)							0			0
Commissions paid | $					$ 0.1
Preferred Class A | Private Placement
Subsidiary, Sale of Stock [Line Items]
Warrants callable			4,158,980
Sale of stock price (usd per share) | $ / shares			$ 10.80
Nonvoting convertible preferred stock issued			415,898
Class A-2 Convertible Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Reverse stock split ratio		10
Convertible preferred stock converted into common stock (in shares)							670,445
Class A-2 Convertible Preferred Stock | Milestone Closing
Subsidiary, Sale of Stock [Line Items]
Share sold (in shares)		3,288,390
Warrants callable		32,883,900
Consideration received | $		$ 26.0
Warrants, term		5 years
Warrant exercise price (usd per share) | $ / shares		$ 0.666
Class A-1 Convertible Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Convertible preferred stock converted into common stock (in shares)							159,198			159,198
Warrant | Preferred Class A | Private Placement
Subsidiary, Sale of Stock [Line Items]
Sale of stock price (usd per share) | $ / shares			$ 0.125
Common stock
Subsidiary, Sale of Stock [Line Items]
Conversions of convertible preferred stock (in shares)							8,296,430	6,566,820
Common stock | Class A-2 Convertible Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Conversions of convertible preferred stock (in shares)							6,704,450			13,271,270
Common stock | Class A-1 Convertible Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Conversions of convertible preferred stock (in shares)							1,591,980			1,591,980
Directors, Executive Officers and Employees | Private Placement
Subsidiary, Sale of Stock [Line Items]
Share sold (in shares)				526,083
Directors, Executive Officers and Employees | Preferred Class A | Private Placement
Subsidiary, Sale of Stock [Line Items]
Warrants callable			526,083
Proceeds from issuance of right to purchase common shares | $			$ 0.6
Certain Directors and Executive Officers | Class A-2 Convertible Preferred Stock | Milestone Closing
Subsidiary, Sale of Stock [Line Items]
Share sold (in shares)		121,581
Warrants callable		1,215,810
Consideration received | $		$ 1.0
2019 Plan
Subsidiary, Sale of Stock [Line Items]
Number of additional shares authorized (in shares)	4,166,860
Number of additional shares authorized yearly increase (in shares)	5.00%
Common stock available for future grant (in shares)							1,360,932			1,360,932
Total common shares reserved for future issuance (in shares)							6,397,750			6,397,750