Stockholders' Equity And Stock-Based Compensation (Narrative) (Details)					1 Months Ended								3 Months Ended				6 Months Ended	9 Months Ended
	Jun. 09, 2022 USD ($) shares / item $ / shares shares	Jan. 01, 2022 shares	Jun. 30, 2021 USD ($) $ / shares shares	Feb. 05, 2021 $ / shares shares	Nov. 30, 2021 shares	Jun. 30, 2021 USD ($) $ / shares	Mar. 31, 2021 shares	Feb. 28, 2021 USD ($)	Feb. 04, 2021 USD ($) shares	Jun. 30, 2020 $ / shares shares	May 31, 2016 $ / shares shares	Nov. 30, 2014 $ / shares shares	Sep. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2022 shares	Sep. 30, 2021 USD ($) $ / shares shares	Mar. 31, 2021 USD ($) shares	Jun. 30, 2021 $ / shares shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2021 $ / shares shares	May 31, 2021 shares	Dec. 31, 2017 shares	Nov. 30, 2017 shares	Dec. 31, 2014 $ / shares
Stockholders' Equity [Line Items]
Preferred stock, shares authorized													50,000,000					50,000,000		50,000,000
Preferred stock, par value | $ / shares													$ 0.001					$ 0.001		$ 0.001
Preferred stock, shares outstanding													0					0		0
Common stock, shares authorized													500,000,000					500,000,000		500,000,000
Common stock, par value | $ / shares													$ 0.001					$ 0.001		$ 0.001
Proceeds from issuance of common stock | $																		$ 14,893,000	$ 56,697,000
Common stock, shares issued													37,228,000					37,228,000		29,716,000
Total stock-based compensation expense | $													$ 723,000		$ 1,577,000			$ 4,443,000	10,990,000
2017 Employee Stock Purchase Plan [Member]
Stockholders' Equity [Line Items]
Shares issued													102,253	188,097			188,097
Shares authorized																						250,000
Increase in shares available for issuance threshold of common stock outstanding, number of shares																		450,000
Increase in shares available for issuance threshold of common stock outstanding, percent outstanding																		1.50%
Shares available for grant													460,999					460,999
2017 Inducement Equity Incentive Plan [Member]
Stockholders' Equity [Line Items]
Term period																		10 years
Shares authorized																					1,000,000		1,000,000
Shares available for grant													886,889					886,889
2017 Plan [Member]
Stockholders' Equity [Line Items]
Term period																		10 years
Shares authorized													1,500,000					1,500,000
Additional common stock reserved for issuance		1,188,657
Increase in shares available for issuance threshold of common stock outstanding, number of shares																		1,200,000
Increase in shares available for issuance threshold of common stock outstanding, percent outstanding																		4.00%
Shares available for grant													2,078,802					2,078,802
Rights Offering [Member]
Stockholders' Equity [Line Items]
Price per share | $ / shares										$ 7.01
Warrants/rights outstanding										641,571			0					0
Proceeds | $									$ 4,500,000
Warrants redeemed				5,139
Period the warrants are exercisable after issuance										30 days
Percentage requirement for warrant redemption										200.00%
Warrants exercised									636,432
Redemption per warrant | $ / shares				$ 0.01						$ 0.01
Period of time required for redemption of warrants										10 days
Tranche One Through Four [Member] | 2017 Inducement Equity Incentive Plan [Member]
Stockholders' Equity [Line Items]
Vesting percentage																		25.00%
General and Administrative [Member]
Stockholders' Equity [Line Items]
Total stock-based compensation expense | $													$ 456,000		1,057,000			$ 2,227,000	4,041,000
Research and Development [Member]
Stockholders' Equity [Line Items]
Total stock-based compensation expense | $													287,000		418,000			1,240,000	4,586,000
Time-Based Options [Member]
Stockholders' Equity [Line Items]
Total stock-based compensation expense | $													562,000		2,072,000			$ 3,814,000	5,758,000
Time-Based Options [Member] | Tranche One Through Four [Member]
Stockholders' Equity [Line Items]
Vesting percentage																		25.00%
Performance Options [Member]
Stockholders' Equity [Line Items]
Total stock-based compensation expense | $								$ 0					$ 18,000		$ (625,000)	$ 4,200,000		$ 233,000	$ 4,903,000
Initial Public Offering [Member]
Stockholders' Equity [Line Items]
Price per share | $ / shares											$ 5.00
Warrants/rights outstanding																					0
Number of common shares called by issuance of warrants											574,985
Common stock received from rights/warrants exercised							68,958									68,958
Warrants exercised							85,385
Exercisable period of warrants or rights											5 years
Private Placement [Member]
Stockholders' Equity [Line Items]
Common stock, par value | $ / shares																								$ 0.001
Price per share | $ / shares												$ 2.67
Number of common shares called by issuance of warrants												299,625
Common stock received from rights/warrants exercised							40,563									40,563
Warrants exercised							45,638
Exercisable period of warrants or rights												7 years
Warrants expired					600
2022 Rights Offering [Member]
Stockholders' Equity [Line Items]
Shares issued	7,317,072
Common stock, par value | $ / shares	$ 0.001
Price per share | $ / shares	$ 2.05
Proceeds from issuance of common stock | $	$ 15,000,000
Additional proceeds that may be received upon exercise of warrants | $	$ 15,000,000
Warrants/rights outstanding	7,317,072												7,310,477					7,310,477
Exercise price of warrants/rights | $ / shares	$ 2.05
Warrant redemption price | $ / shares	$ 0.01
Number of shares per unit | shares / item	1
Number of warrants per unit	1
Number of shares per warrant | shares / item	1
Warrant redemption, notice period	30 days
Warrant redemption restrictions, stock price as percentage of exercise price	200.00%
Warrant redemption restrictions, number of consecutive trading days at which stock price must exceed exercise price	20 days
Warrant redemption restrictions, minimum period before redemption	3 months
Warrants exercised																		6,595
Chairman, Robert W. Duggan [Member] | Private Placement [Member]
Stockholders' Equity [Line Items]
Shares issued			3,048,780
Common stock, par value | $ / shares			$ 0.001			$ 0.001											$ 0.001
Price per share | $ / shares			$ 16.40			16.40											16.40
Debt converted | $			$ 41,000,000.0
Chairman, Robert W. Duggan [Member] | 2022 Rights Offering [Member]
Stockholders' Equity [Line Items]
Percentage of shares purchased during offering	56.00%
Common Stock [Member]
Stockholders' Equity [Line Items]
Shares issued																		7,317,000	289,000
Warrants exercised																			45,000
Robert W. Duggan [Member] | Private Placement [Member]
Stockholders' Equity [Line Items]
Price per share | $ / shares			$ 16.40			$ 16.40											$ 16.40
Proceeds from issuance of common stock | $						$ 8,400,000
Stifel, Nicolaus & Company Inc. [Member] | At the Market Offering [Member]
Stockholders' Equity [Line Items]
Value of warrants/rights | $									$ 60,000,000.0
Warrants/rights outstanding															288,490				288,490
Exercise price of warrants/rights | $ / shares															$ 27.73				$ 27.73
Proceeds | $																			$ 7,400,000