Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Details)

v3.19.1
FAIR VALUE MEASUREMENTS (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Assets    
Short-term Investments $ 42,387,000 $ 66,218,000
Nonrecurring [Member]    
Assets    
Licensed technology (net) 41,697,000 43,042,000
Goodwill 32,466,000 32,466,000
Nonrecurring [Member] | Licensed technology [Member]    
Assets    
Licensed technology (net) 0 0
Nonrecurring [Member] | Licensed technology [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets    
Licensed technology (net) 0 0
Nonrecurring [Member] | Licensed technology [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets    
Licensed technology (net) 0 0
Nonrecurring [Member] | Licensed technology [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets    
Licensed technology (net) 41,697,000 43,042,000
Nonrecurring [Member] | Goodwill [Member]    
Assets    
Goodwill 0 0
Nonrecurring [Member] | Goodwill [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets    
Goodwill 0 0
Nonrecurring [Member] | Goodwill [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets    
Goodwill 0 0
Nonrecurring [Member] | Goodwill [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets    
Goodwill 32,466,000 32,466,000
Recurring Member    
Assets    
Short-term Investments 42,387,000 66,218,000
Recurring Member | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets    
Short-term Investments 0 0
Recurring Member | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets    
Short-term Investments 42,387,000 66,218,000
Recurring Member | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets    
Short-term Investments $ 0 $ 0