Stockholders Equity (Narrative) (Details) - USD ($)							2 Months Ended	9 Months Ended
	Oct. 28, 2021	Mar. 17, 2021	Jan. 26, 2021	Mar. 27, 2020	Feb. 12, 2020	Jan. 27, 2020	Mar. 27, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Class of Stock [Line Items]
Common stock, shares authorized								217,000,000		217,000,000
Proceeds from issuance of common stock								$ 19,363,000	$ 22,893,000
Common stock, par value (in dollars per share)								$ 0.01		$ 0.01
Securities Purchase Agreement [Member]
Class of Stock [Line Items]
Common stock issued in registered public financings (in shares)				7,717,661	993,139
Shares Issued, Price Per Share			$ 3.25
Proceeds from issuance of private placement				$ 22,200,000	$ 2,800,000		$ 25,000,000.0
Stock Issued During Period, Shares, New Issues				7,717,661	993,139
Number of common warrants sold per share of common stock				1		1
Securities Purchase Agreement First Tranche [Member]
Class of Stock [Line Items]
Proceeds from issuance of private placement			$ 6,100,000
Securities Purchase Agreement Second Tranche [Member]
Class of Stock [Line Items]
Proceeds from issuance of private placement		$ 13,900,000
Common Stock [Member]
Class of Stock [Line Items]
Common stock issued in registered public financings (in shares)								6,153,847	8,710,800
Stock Issued During Period, Shares, New Issues								6,153,847	8,710,800
Common Stock Subject to Mandatory Redemption [Member] | Securities Purchase Agreement [Member]
Class of Stock [Line Items]
Common stock issued in registered public financings (in shares)			6,153,847				8,710,800
Shares Issued, Price Per Share			$ 3.25	$ 2.87			$ 2.87
Stock Issued During Period, Shares, New Issues			6,153,847				8,710,800
Common Stock Subject to Mandatory Redemption [Member] | Securities Purchase Agreement First Tranche [Member]
Class of Stock [Line Items]
Common stock issued in registered public financings (in shares)			1,867,912
Stock Issued During Period, Shares, New Issues			1,867,912
Common Stock Subject to Mandatory Redemption [Member] | Securities Purchase Agreement Second Tranche [Member]
Class of Stock [Line Items]
Common stock issued in registered public financings (in shares)		4,285,935
Stock Issued During Period, Shares, New Issues		4,285,935
Warrants and Rights Subject to Mandatory Redemption [Member] | Securities Purchase Agreement [Member]
Class of Stock [Line Items]
Number of securities called by warrants			6,153,847	8,710,800			8,710,800
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			6,153,847	8,710,800			8,710,800
Warrants and Rights Subject to Mandatory Redemption [Member] | Securities Purchase Agreement First Tranche [Member]
Class of Stock [Line Items]
Number of securities called by warrants			1,867,912
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			1,867,912
Warrants and Rights Subject to Mandatory Redemption [Member] | Securities Purchase Agreement Second Tranche [Member]
Class of Stock [Line Items]
Number of securities called by warrants		4,285,935
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		4,285,935
Subsequent Event [Member]
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.01
Subsequent Event [Member] | Securities Purchase Agreement [Member]
Class of Stock [Line Items]
Proceeds from equity offerings, gross	$ 7,000,000.0
Shares Issued, Price Per Share	$ 3.30
Subsequent Event [Member] | Cystic Fibrosis Foundation [Member] | Securities Purchase Agreement [Member]
Class of Stock [Line Items]
Common stock issued in registered public financings (in shares)	909,091
Stock Issued During Period, Shares, New Issues	909,091
Subsequent Event [Member] | Innoviva Strategic Opportunities LLC [Member] | Securities Purchase Agreement [Member]
Class of Stock [Line Items]
Common stock issued in registered public financings (in shares)	1,212,122
Stock Issued During Period, Shares, New Issues	1,212,122