Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Fair Value Measurements - National Financial Instruments Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Assets      
Long-term investments, at fair value $ 903   $ 1,414
Total 903   1,414
Liabilities      
Liabilities 4,764   5,168
National Holdings Corporation [Member]      
Assets      
Total   $ 3,406  
Liabilities      
Liabilities   8,897  
Contingently Issuable Warrant [Member]      
Liabilities      
Liabilities     302
Warrant [Member]      
Liabilities      
Liabilities 91   179
Helocyte Convertible Note One [Member]      
Liabilities      
Liabilities 4,673   4,487
Avenue Convertible Note [Member]      
Liabilities      
Liabilities     200
Corporate stock Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   272  
Municipal bonds Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   2,928  
Restricted stock Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   206  
Corporate stock Liabilities [Member] | National Holdings Corporation [Member]      
Liabilities      
Liabilities   77  
Warrants Issuable [Member] | National Holdings Corporation [Member]      
Liabilities      
Liabilities   8,190  
Contingent Consideration [Member] | National Holdings Corporation [Member]      
Liabilities      
Liabilities   630  
Fair Value, Inputs, Level 1 [Member]      
Assets      
Long-term investments, at fair value 0   0
Total 0   0
Liabilities      
Liabilities 0   0
Fair Value, Inputs, Level 1 [Member] | National Holdings Corporation [Member]      
Assets      
Total   3,200  
Liabilities      
Liabilities   77  
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   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   272  
Fair Value, Inputs, Level 1 [Member] | Municipal bonds Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   2,928  
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   77  
Fair Value, Inputs, Level 1 [Member] | Warrants Issuable [Member] | National Holdings Corporation [Member]      
Liabilities      
Liabilities   0  
Fair Value, Inputs, Level 1 [Member] | Contingent Consideration [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   0
Liabilities      
Liabilities 0   0
Fair Value, Inputs, Level 2 [Member] | National Holdings Corporation [Member]      
Assets      
Total   206  
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   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   0  
Fair Value, Inputs, Level 2 [Member] | Restricted stock Assets [Member] | National Holdings Corporation [Member]      
Assets      
Total   206  
Fair Value, Inputs, Level 2 [Member] | Corporate stock Liabilities [Member] | National Holdings Corporation [Member]      
Liabilities      
Liabilities   0  
Fair Value, Inputs, Level 2 [Member] | Contingent Consideration [Member] | National Holdings Corporation [Member]      
Liabilities      
Liabilities   0  
Fair Value, Inputs, Level 3 [Member]      
Assets      
Long-term investments, at fair value 903   1,414
Total 903   1,414
Liabilities      
Liabilities 4,764   5,168
Fair Value, Inputs, Level 3 [Member] | National Holdings Corporation [Member]      
Assets      
Total   0  
Liabilities      
Liabilities   8,820  
Fair Value, Inputs, Level 3 [Member] | Contingently Issuable Warrant [Member]      
Liabilities      
Liabilities     302
Fair Value, Inputs, Level 3 [Member] | Warrant [Member]      
Liabilities      
Liabilities 91   179
Fair Value, Inputs, Level 3 [Member] | Helocyte Convertible Note One [Member]      
Liabilities      
Liabilities $ 4,673   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   8,190  
Fair Value, Inputs, Level 3 [Member] | Contingent Consideration [Member] | National Holdings Corporation [Member]      
Liabilities      
Liabilities   $ 630