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FAIR VALUE MEASUREMENTS (Details) - USD ($)
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value $ 77,976,481 $ 77,529,350
Noncash or Part Noncash Acquisition, Interest Acquired 15.00%  
Cash and Equivalents    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value $ 25,882,554 15,822,495
U.S. Government Securities    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 36,184,904 36,091,261
Corporate Debt    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 7,652,455 7,557,029
Certificates of Deposit    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 7,617,551 17,727,111
GCS Holdings    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 365,017 331,454
Warrant [Member]    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 274,000  
Level 1    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 33,171,162 23,298,716
Level 1 | Cash and Equivalents    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 25,882,554 15,822,495
Level 1 | U.S. Government Securities    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 6,923,591 7,144,767
Level 1 | GCS Holdings    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 365,017 331,454
Level 1 | Warrant [Member]    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 0  
Level 2    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 44,531,319 54,230,634
Level 2 | U.S. Government Securities    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 29,261,313 28,946,494
Level 2 | Corporate Debt    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 7,652,455 7,557,029
Level 2 | Certificates of Deposit    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 7,617,551 17,727,111
Level 2 | GCS Holdings    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 0  
Level 2 | Warrant [Member]    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 0  
Level 3    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 274,000 0
Level 3 | Cash and Equivalents    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 0 0
Level 3 | U.S. Government Securities    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 0 0
Level 3 | Corporate Debt    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 0 0
Level 3 | Certificates of Deposit    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 0 0
Level 3 | GCS Holdings    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value 0 $ 0
Level 3 | Warrant [Member]    
Fair Value Measurements [Line Items]    
Financial Instruments, Owned, at Fair Value $ 274,000