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INCOME TAXES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 13, 2017
Income Tax Provision [Line Items]        
Domestic $ 5,169 $ (39,898) $ (36,339)  
Foreign (5,594) (2,573) (1,505)  
Total loss before income taxes (425) (42,471) (37,844)  
Federal (96) 0 11  
State 142 140 94  
Total income tax expense $ 46 $ 140 $ 105  
Reconciliation of income taxes at U.S. Federal statutory rate to the provision for income taxes        
U.S. federal statutory rate 21.00% 35.00% 35.00%  
State taxes (24.84%) 2.26% 2.20%  
Foreign taxes (92.04%) (1.28%) (0.81%)  
Change in valuation allowance 369.27% 4.58% (43.96%)  
Stock-based compensation (874.29%) (1.21%) (0.54%)  
Tax credits 700.35% 4.96% 8.77%  
Interest expense 218.47% 2.90% 5.75%  
Effect of rate changes 13.44% (130.88%) (4.65%)  
Convertible senior notes refinancing 0.00% 6.55% 0.00%  
Effect of the adoption of ASU 2016-09 0.00% 68.89% 0.00%  
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent (132.96%) 0.00% 0.00%  
Effective Income Tax Rate Reconciliation, Tax Reserves, Percent (202.98%) 0.00% 0.00%  
Other (6.15%) 7.90% (2.04%)  
Effective tax rate (10.73%) (0.33%) (0.28%)  
Deferred tax assets:        
Net operating loss carry-forwards $ 79,446 $ 95,067    
Federal and state credits 17,730 15,048    
Depreciation and amortization 2,851 2,593    
Accruals and reserves 11,009 2,743    
Deferred revenue 0 1,841    
Stock based compensation 18,302 16,925    
Inventory 848 552    
Other 127 139    
Total deferred tax assets 130,313 134,908    
Discount on convertible senior notes (11,655) (14,678)    
Net deferred tax assets, before valuation allowance 118,658 120,230    
Less: valuation allowance (118,658) (120,230)    
Net deferred tax assets 0 0    
Non-US Net Operating Loss $ 11,400      
Minimum Cumulative Percentage of Change in Ownership as Condition to Offset Taxable Income or Tax 50.00%      
Increase in valuation allowance for deferred tax assets $ 1,600 $ (28,500) $ 800  
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Income Tax Expense (Benefit) $ 55,700      
United States Statutory Tax Rate 21.00% 35.00% 35.00%  
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]        
Unrecognized Tax Benefits $ 2,473      
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions 408      
Unrecognized Tax Benefits 2,881 $ 2,473    
Convertible Senior Notes Due 2022 [Member]        
Deferred tax assets:        
Debt Instrument, Convertible, Carrying Amount of Equity Component       $ 70,900
Federal        
Deferred tax assets:        
Net operating losses 346,200      
Net Operating Loss, Subject to Limitation 191,100      
Available Net Operating Loss, Subject to Limitation 108,000      
Future NOL's Which Will Become Available (2019-2022) 10,300      
Future NOL's Which Will Become Available (2023) 3,500      
Future NOL's Which Will Become Available (2024-2025) 1,400      
Future NOL's Expired and Unused 35,800      
State        
Deferred tax assets:        
Net operating losses 159,200      
Research Tax Credit Carryforward [Member] | Federal        
Deferred tax assets:        
Tax Credit Carryforward, Amount 12,700      
Research Tax Credit Carryforward [Member] | State        
Deferred tax assets:        
Tax Credit Carryforward, Amount $ 6,300