Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Detail)

v3.7.0.1
Fair Value Measurements - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended
Sep. 30, 2016
Mar. 17, 2014
Mar. 31, 2017
Dec. 31, 2016
Dec. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Method Investments   $ 250,000 $ 300,000 $ 300,000  
Equity Method Investment, Ownership Percentage   35.00% 56.60%    
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease), Total     $ 700,000    
Investment Owned, at Fair Value     1,206,000 $ 2,357,000  
Equity Securities Called by Warrant         $ 10,000
Origo Acquisition Corporation [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Investment Owned, at Fair Value     $ 500,000    
Fair Value Assumptions Probability Of Business Combination     18.40%    
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 43.40%        
Warrant Expiration Period 5 years        
Percentage of outstanding shares, Tendered 80.00%        
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 3.25        
Warrants Not Settleable in Cash, Fair Value Disclosure $ 5,400,000        
Binomial Lattice Model [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Business Acquisition, Share Price     $ 0.11    
Fair Value Assumptions, Expected Volatility Rate     0.18%    
Private Units [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Share Price     $ 9.83    
Argus Neurooptics Llc [Member] | Class A Preferred Stock [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Shares Received Under Purchase Agreement   $ 13,409,962      
Percentage Of Shares Received Under Purchase Agreement   83.00%      
Preferred Units, Issued   16,091,954