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Organization, Basis Of Presentation And Significant Accounting And Reporting Policies (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 20, 2020
USD ($)
Jun. 09, 2020
USD ($)
Jul. 02, 2019
USD ($)
Jun. 28, 2019
USD ($)
Apr. 15, 2016
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
country
May 01, 2020
USD ($)
Apr. 10, 2020
USD ($)
Mar. 22, 2016
USD ($)
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]                        
Accumulated deficit           $ 429,698,000   $ 429,698,000 $ 422,161,000      
One time adjustment           (429,698,000)   (429,698,000) $ (422,161,000)      
Downward adjustments to recognize revenue for services provided in a prior period               $ 79,000        
Impairment losses           $ 0 $ 0          
Minimum [Member]                        
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]                        
Number of countries novel coronavirus has spread | country                 100      
2020 Exercise of Warrants [Member]                        
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]                        
Proceeds from exercise of warrants   $ 5,058,608                    
Common Stock | 2019 Offerings [Member]                        
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]                        
Net proceeds from public offering     $ 2,092,000 $ 13,521,000                
Subsequent Event | 2020 Private Placement [Member]                        
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]                        
Proceeds from issuance of private placement $ 11,000,000                      
CARES Act [Member]                        
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]                        
Proceeds from stimulus check received pursuant to the CARES Act                     $ 89,000  
DECD [Member]                        
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]                        
DECD maximum borrowing capacity                       $ 4,000,000
DECD initial disbursement         $ 2,000,000              
DECD remaining borrowing capacity         $ 2,000,000              
BBVA USA [Member] | CARES Act [Member] | Paycheck Protection Program Loan (PPP) [Member]                        
Organization Consolidation And Summary Of Significant Accounting Policies [Line Items]                        
Aggregate amount of loan                   $ 1,005,767