Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - National Financial Instruments Measured at Fair Value on Recurring Basis (Detail)

v3.6.0.2
Fair Value Measurements - National Financial Instruments Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Assets      
Long-term investments, at fair value $ 1,414   $ 2,485
Total 1,414    
Liabilities      
Liabilities 5,168    
National Holdings Corporation [Member]      
Assets      
Total   $ 2,357  
Liabilities      
Liabilities   14,657  
Contingently Issuable Warrant [Member]      
Liabilities      
Liabilities 302    
Warrant [Member]      
Liabilities      
Liabilities 179   114
Helocyte Convertible Note One [Member]      
Liabilities      
Liabilities 4,487    
Avenue Convertible Note [Member]      
Liabilities      
Liabilities 200    
Corporate stock Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   101  
Liabilities      
Liabilities   298  
Municipal bonds Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   2,111  
Restricted stock Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   145  
Warrants Issuable [Member] | National Holdings Corporation [Member]      
Liabilities      
Liabilities   14,359  
Fair Value, Inputs, Level 1 [Member]      
Assets      
Long-term investments, at fair value 0   0
Total 0    
Liabilities      
Liabilities 0    
Fair Value, Inputs, Level 1 [Member] | National Holdings Corporation [Member]      
Assets      
Total   101  
Liabilities      
Liabilities   298  
Fair Value, Inputs, Level 1 [Member] | Contingently Issuable Warrant [Member]      
Liabilities      
Liabilities 0    
Fair Value, Inputs, Level 1 [Member] | Warrant [Member]      
Liabilities      
Liabilities 0   0
Fair Value, Inputs, Level 1 [Member] | Helocyte Convertible Note One [Member]      
Liabilities      
Liabilities 0    
Fair Value, Inputs, Level 1 [Member] | Avenue Convertible Note [Member]      
Liabilities      
Liabilities 0    
Fair Value, Inputs, Level 1 [Member] | Corporate stock Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   101  
Fair Value, Inputs, Level 1 [Member] | Municipal bonds Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   0  
Fair Value, Inputs, Level 1 [Member] | Restricted stock Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   0  
Fair Value, Inputs, Level 1 [Member] | Corporate stock Liabilities [Member] | National Holdings Corporation [Member]      
Liabilities      
Liabilities   298  
Fair Value, Inputs, Level 1 [Member] | Warrants Issuable [Member] | National Holdings Corporation [Member]      
Liabilities      
Liabilities   0  
Fair Value, Inputs, Level 2 [Member]      
Assets      
Long-term investments, at fair value 0   0
Total 0    
Liabilities      
Liabilities 0    
Fair Value, Inputs, Level 2 [Member] | National Holdings Corporation [Member]      
Assets      
Total   2,256  
Liabilities      
Liabilities   0  
Fair Value, Inputs, Level 2 [Member] | Contingently Issuable Warrant [Member]      
Liabilities      
Liabilities 0    
Fair Value, Inputs, Level 2 [Member] | Warrant [Member]      
Liabilities      
Liabilities 0   0
Fair Value, Inputs, Level 2 [Member] | Helocyte Convertible Note One [Member]      
Liabilities      
Liabilities 0    
Fair Value, Inputs, Level 2 [Member] | Avenue Convertible Note [Member]      
Liabilities      
Liabilities 0    
Fair Value, Inputs, Level 2 [Member] | Corporate stock Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   0  
Fair Value, Inputs, Level 2 [Member] | Municipal bonds Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   2,111  
Fair Value, Inputs, Level 2 [Member] | Restricted stock Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   145  
Fair Value, Inputs, Level 2 [Member] | Corporate stock Liabilities [Member] | National Holdings Corporation [Member]      
Liabilities      
Liabilities   0  
Fair Value, Inputs, Level 2 [Member] | Warrants Issuable [Member] | National Holdings Corporation [Member]      
Liabilities      
Liabilities   0  
Fair Value, Inputs, Level 3 [Member]      
Assets      
Long-term investments, at fair value 1,414   2,485
Total 1,414    
Liabilities      
Liabilities 5,168    
Fair Value, Inputs, Level 3 [Member] | National Holdings Corporation [Member]      
Assets      
Total   0  
Liabilities      
Liabilities   14,359  
Fair Value, Inputs, Level 3 [Member] | Contingently Issuable Warrant [Member]      
Liabilities      
Liabilities 302    
Fair Value, Inputs, Level 3 [Member] | Warrant [Member]      
Liabilities      
Liabilities 179   $ 114
Fair Value, Inputs, Level 3 [Member] | Helocyte Convertible Note One [Member]      
Liabilities      
Liabilities 4,487    
Fair Value, Inputs, Level 3 [Member] | Avenue Convertible Note [Member]      
Liabilities      
Liabilities $ 200    
Fair Value, Inputs, Level 3 [Member] | Corporate stock Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   0  
Fair Value, Inputs, Level 3 [Member] | Municipal bonds Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   0  
Fair Value, Inputs, Level 3 [Member] | Restricted stock Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   0  
Fair Value, Inputs, Level 3 [Member] | Corporate stock Liabilities [Member] | National Holdings Corporation [Member]      
Liabilities      
Liabilities   0  
Fair Value, Inputs, Level 3 [Member] | Warrants Issuable [Member] | National Holdings Corporation [Member]      
Liabilities      
Liabilities   $ 14,359