Stockholders' Equity And Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 01, 2020	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2018	Apr. 06, 2020	Dec. 31, 2019	Nov. 30, 2017	Dec. 31, 2016	Dec. 31, 2014
Stockholders' Equity [Line Items]
Common stock, par value		$ 0.001				$ 0.001
Proceeds from issuance of common stock under employee stock purchase plan		$ 255	$ 272
Common stock, shares issued		20,869,000				20,825,000
Total stock-based compensation expense		$ 2,626	2,361
Cash received from option exercises		$ 9	222
2017 Employee Stock Purchase Plan [Member]
Stockholders' Equity [Line Items]
Common stock, shares issued		43,224
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		396,971
2017 Inducement Equity Incentive Plan [Member]
Stockholders' Equity [Line Items]
Term period		10 years
Shares authorized							1,000,000
Shares available for grant		8,492
2017 Plan [Member]
Stockholders' Equity [Line Items]
Term period		10 years
Shares authorized		1,500,000
Additional common stock reserved for issuance	833,018
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		1,721,093
First Vesting Portion [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		$ 1,749	1,485
Research and development [Member]
Stockholders' Equity [Line Items]
Total stock-based compensation expense		$ 877	$ 876
Employee Stock Option [Member]
Stockholders' Equity [Line Items]
Options granted		178,000
Warrants exercised		750
Exercise price		$ 16.48
Performance Shares [Member]
Stockholders' Equity [Line Items]
Options granted				69,375
Subsequent Event [Member]
Stockholders' Equity [Line Items]
Value of warrants/rights					$ 30,000
Private Placement [Member]
Stockholders' Equity [Line Items]
Common stock, par value									$ 0.001
Common Stock
Stockholders' Equity [Line Items]
Warrants exercised		1,000	99,000
MDB Capital Group, LLC [Member] | Initial Public Offering [Member]
Stockholders' Equity [Line Items]
Price per share								$ 5.00
Warrants/rights outstanding		121,609
Exercisable period of warrants or rights		5 years
Number of common shares called by issuance of warrants								574,985
MDB Capital Group, LLC [Member] | Private Placement [Member]
Stockholders' Equity [Line Items]
Price per share									$ 2.67
Warrants/rights outstanding		46,238
Exercisable period of warrants or rights		7 years
Number of common shares called by issuance of warrants									299,625