Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Detail)

v3.10.0.1
Fair Value Measurements - Additional Information (Detail) - USD ($)
 5 Months Ended 6 Months Ended
Mar. 15, 2018
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease), Total   $ 800,000  
Investment Owned, at Fair Value   3,812,000 $ 1,985,000
Helocyte [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Beginning Balance   0 $ 87,000
Debt Conversion, Converted Instrument, Amount   0  
Origo Acquisition Corporation [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Investment Owned, at Fair Value   $ 600,000  
Fair Value Assumptions Probability Of Business Combination   13.93%  
Working Capital Note Convertible To Equity   $ 300,000  
National Holdings Corporation [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Percentage of Outstanding Stock To Be Issued Upon Exercise of Warrants 44.00%    
Warrants Not Settleable in Cash, Fair Value Disclosure $ 13,600,000    
Binomial Lattice Model [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value Assumptions, Exercise Price   $ 0.18  
Binomial Lattice Model [Member] | Warrant [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Business Acquisition, Share Price   0.30  
Private Units [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Share Price   $ 1.80