General - Schedule of Error Corrections and Prior Period Adjustments (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Jun. 30, 2022
Statement of Financial Position [Abstract]
Additional paid-in capital	$ 453,370		$ 451,608
Accumulated deficit	(466,483)		$ (457,484)
Statement of Operations and Comprehensive Loss [Abstract]
Research and development expenses	4,576	$ 4,481
Selling, general and administrative expenses	4,165	4,204
Total operating expenses	8,741	8,685
Operating loss	(8,325)	(8,340)
Net loss	9,000	9,000
Total other comprehensive loss	$ (8,981)	$ (8,998)
Basic loss per common share	$ (0.77)	$ (1.1)
Diluted loss per common share	$ (0.77)	$ (1.1)
Statement of Stockholders' Equity [Abstract]
Compensation expense for issuance of stock options	$ 1,661	$ 2,271
Net loss	9,000	9,000
Statement of Cash Flows [Abstract]
Net loss	9,000	9,000
Stock option compensation expense	$ 1,661	2,271
Previously Reported [Member]
Statement of Financial Position [Abstract]
Additional paid-in capital		434,305		$ 435,922
Accumulated deficit		(429,179)		(438,836)
Statement of Operations and Comprehensive Loss [Abstract]
Research and development expenses		4,240
Selling, general and administrative expenses		3,648
Total operating expenses		7,888
Operating loss		(7,543)
Net loss		(8,203)
Total other comprehensive loss		$ (8,201)
Basic loss per common share		$ (1)
Diluted loss per common share		$ (1)
Statement of Stockholders' Equity [Abstract]
Compensation expense for issuance of stock options		$ 1,474
Net loss		(8,203)
Statement of Cash Flows [Abstract]
Net loss		(8,203)
Stock option compensation expense		1,474
Revision of Prior Period, Adjustment [Member]
Statement of Financial Position [Abstract]
Additional paid-in capital		797		1,299
Accumulated deficit		(797)		(1,299)
Statement of Operations and Comprehensive Loss [Abstract]
Research and development expenses		241
Selling, general and administrative expenses		556
Total operating expenses		797
Operating loss		(797)
Net loss		(797)
Total other comprehensive loss		$ (797)
Basic loss per common share		$ (0.1)
Diluted loss per common share		$ (0.1)
Statement of Stockholders' Equity [Abstract]
Compensation expense for issuance of stock options		$ 797
Net loss		(797)
Statement of Cash Flows [Abstract]
Net loss		(797)
Stock option compensation expense		797
As Revised [Member]
Statement of Financial Position [Abstract]
Additional paid-in capital		435,102		437,221
Accumulated deficit		(429,976)		$ (440,135)
Statement of Operations and Comprehensive Loss [Abstract]
Research and development expenses		4,481
Selling, general and administrative expenses		4,204
Total operating expenses		8,685
Operating loss		(8,340)
Net loss		(9,000)
Total other comprehensive loss		$ (8,998)
Basic loss per common share		$ (1.1)
Diluted loss per common share		$ (1.1)
Statement of Stockholders' Equity [Abstract]
Compensation expense for issuance of stock options		$ 2,271
Net loss		(9,000)
Statement of Cash Flows [Abstract]
Net loss		(9,000)
Stock option compensation expense		$ 2,271