Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Details)

v3.19.2
FAIR VALUE MEASUREMENTS (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Assets    
Short-term investments $ 19,903,000 $ 66,218,000
Recurring    
Assets    
Short-term investments 19,903,000 66,218,000
Recurring | Available-for-sale Securities | Level 1    
Assets    
Short-term investments 0 0
Recurring | Available-for-sale Securities | Level 2    
Assets    
Short-term investments 19,903,000 66,218,000
Recurring | Available-for-sale Securities | Level 3    
Assets    
Short-term investments 0 0
Nonrecurring    
Assets    
Licensed technology, net 38,765,000 43,042,000
Goodwill 32,466,000 32,466,000
Nonrecurring | Licensed technology    
Assets    
Licensed technology, net (367,000) 0
Nonrecurring | Licensed technology | Level 1    
Assets    
Licensed technology, net 0 0
Nonrecurring | Licensed technology | Level 2    
Assets    
Licensed technology, net 0 0
Nonrecurring | Licensed technology | Level 3    
Assets    
Licensed technology, net 38,765,000 43,042,000
Nonrecurring | Goodwill    
Assets    
Goodwill 0 0
Nonrecurring | Goodwill | Level 1    
Assets    
Goodwill 0 0
Nonrecurring | Goodwill | Level 2    
Assets    
Goodwill 0 0
Nonrecurring | Goodwill | Level 3    
Assets    
Goodwill $ 32,466,000 $ 32,466,000