Organization and Summary of Significant Accounting Policies - Fair Value of Warrant and Derivative Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Schedule of Organization and Summary of Significant Accounting Policies [Line Items]
Reclassification of warrants to additional paid-in capital	$ (2,897)
Warrant Liability
Schedule of Organization and Summary of Significant Accounting Policies [Line Items]
Fair value, beginning of period	320	$ 0
Issuance of warrants	1,654	1,430
Reclassification of warrants to additional paid-in capital	(2,897)	0
Change in fair value	923	(1,110)
Fair value, end of period	0	320
Derivative Liability
Schedule of Organization and Summary of Significant Accounting Policies [Line Items]
Fair value, beginning of period	0	25
Issuance of derivatives	0	0
Change in fair value	0	(25)
Fair value, end of period	$ 0	$ 0