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Stock Benefit Plans and Equity Transactions - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 08, 2018
Mar. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
Oct. 25, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Warrant outstanding     22,301,515      
Stock-based compensation     $ 1,612 $ 619    
2017 Common Stock Warrants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price of warrants     $ 2.00      
Warrant outstanding     3,757,000      
Number of warrants exercised     0 400,000    
Proceeds from exercise of warrant       $ 900    
2017 Banker Warrants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price of warrants     $ 2.50      
Warrant outstanding     167,418      
2018 Common Stock Warrants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of warrants issued (in shares)     1,800,000      
Exercise price of warrants     $ 3.50      
Warrant outstanding     13,996,851      
Warrants term     5 years      
Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of preferred shares converted to common stock     1,858,000 637,000    
Series A Convertible Preferred Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of preferred shares converted     3,715 1,274    
Number of preferred shares outstanding for being conversion     328      
Series A Convertible Preferred Stock | Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of preferred shares converted to common stock     1,857,586 636,997    
Number of preferred shares outstanding for being conversion to common stock     164,087      
2017 Private Placement | 2017 Common Stock Warrants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price of warrants     $ 2.00      
2017 Private Placement | 2017 Banker Warrants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price of warrants     $ 2.50      
2017 Private Placement | Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Issuance of common stock upon securities purchase agreement   1,809,628        
Common stock purchase price per share   $ 2.00        
2017 Private Placement | Series A Convertible Preferred Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Preferred stock, shares issued   15,245        
Shares issued price per share   $ 1,000        
2017 Private Placement | Series A Convertible Preferred Stock | Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Preferred stock convertible to common stock   7,622,372        
2018 Private Placement            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price of warrants $ 3.50          
Proceeds from exercise of warrant     $ 3,400      
Warrant expiration period 5 years          
Aggregate gross proceeds for private placement $ 45,200          
2018 Private Placement | 2017 Common Stock Warrants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price of warrants       $ 2.00    
Warrant outstanding       2,400,000    
Number of warrants exercised       1,700,000    
Proceeds from exercise of warrant $ 3,400          
2018 Private Placement | 2017 Banker Warrants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Warrant outstanding     167,418      
Number of warrants exercised     0 304,182    
Proceeds from exercise of warrant       $ 800    
2018 Private Placement | Series A Convertible Preferred Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Preferred stock, shares issued 45,200          
Shares issued price per share $ 1,000          
2018 Private Placement | Series A Convertible Preferred Stock | Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Preferred stock convertible to common stock 14,349,236          
Maximum | 2017 Common Stock Warrants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Beneficial ownership limitation percentage     4.99%      
Beneficial ownership, limitation option, percentage     9.99%      
Beneficial ownership limitation notification period     61 days      
Maximum | 2018 Common Stock Warrants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Beneficial ownership limitation percentage     4.99%      
Beneficial ownership, limitation option, percentage     9.99%      
Beneficial ownership limitation notification period     61 days      
Maximum | 2017 Private Placement | 2017 Banker Warrants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of warrants issued (in shares)     471,600      
Maximum | 2017 Private Placement | Common Stock | 2017 Common Stock Warrants            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of warrants issued (in shares)     9,432,000      
Maximum | 2018 Private Placement | Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of warrants issued (in shares) 12,196,851          
2016 Equity Incentive Plan | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares available for grant           500,000
2016 Equity Incentive Plan | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares available for grant           1,250,000
Two Thousand Seventeen Distributor Inducement Plan | Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares available for grant         75,000  
Number of shares earned and issued         15,000  
Two Thousand Seventeen Distributor Inducement Plan | Common Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of warrants issued (in shares)     300,000      
Common stock issued     17,000      
Stock-based compensation     $ 100 $ 100    
Number of warrants available to be granted         50,000  
Two Thousand Seventeen Distributor Inducement Plan | Common Stock | Board of Directors Chairman            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share authorized grant of warrants         1,000,000  
2017 Development Services Plan | Common Stock | Board of Directors Chairman            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share authorized grant of warrants     2,300,000   3,000,000  
Common stock issued     0      
Issuance of shares granted to distributors was vested     0