Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Detail)

v3.8.0.1
Fair Value Measurements - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 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 $ 100  
Investment Owned, at Fair Value 4,278 $ 1,985
Origo Acquisition Corporation [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment Owned, at Fair Value $ 1,300  
Fair Value Assumptions Probability Of Business Combination 38.40%  
Working Capital Note Convertible To Equity $ 300  
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 $ 5,400  
Binomial Lattice Model [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Assumptions, Exercise Price $ 0.44  
Binomial Lattice Model [Member] | Warrant [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Business Acquisition, Share Price 0.36  
Private Units [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Share Price $ 10.96