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STOCK-BASED COMPENSATION PLANS - Other Disclosures (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 13, 2017
Apr. 01, 2016
Mar. 16, 2015
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Weighted average exercise price              
Granted (in dollars per share)         $ 6.67    
Range of assumptions used in estimating fair value of options              
Expected dividends         0.00% 0.00% 0.00%
Expected life         5 years    
Weighted average grant-date fair value              
Total fair value of restricted stock awards, restricted stock units, performance-based stock awards and performance-based stock units on date vested         $ 20,515,000 $ 10,376,000 $ 9,138,000
Shares available for future issuance (in shares)         6,790,756    
Tax benefit for employee stock-based compensation         $ 0 0 0
Stock-based compensation (in dollars)         25,657,000 $ 19,768,000 $ 21,699,000
Unrecognized stock-based compensation expense         $ 7,500,000    
Weighted average period (in years)         2 years    
Minimum              
Range of assumptions used in estimating fair value of options              
Expected life           5 years 5 years
Maximum              
Range of assumptions used in estimating fair value of options              
Expected life           10 years 6 years
Product cost of revenue [Member]              
Weighted average grant-date fair value              
Stock-based compensation (in dollars)         $ 514,000 $ 359,000 $ 317,000
Service cost of revenue [Member]              
Weighted average grant-date fair value              
Stock-based compensation (in dollars)         1,448,000 1,314,000 1,524,000
Research and development [Member]              
Weighted average grant-date fair value              
Stock-based compensation (in dollars)         7,337,000 5,014,000 5,439,000
Sales and marketing [Member]              
Weighted average grant-date fair value              
Stock-based compensation (in dollars)         4,885,000 6,209,000 5,423,000
General and administrative [Member]              
Weighted average grant-date fair value              
Stock-based compensation (in dollars)         $ 11,473,000 $ 6,872,000 $ 8,996,000
Stock options              
Number of shares              
Outstanding at the beginning of the period (in shares)       5,610,106 5,610,106    
Granted (in shares)         7,760    
Exercised (in shares)         (105,688)    
Forfeited (in shares)         (35,907)    
Expired (in shares)         (5,041,084)    
Outstanding at the end of the period (in shares)         435,187 5,610,106  
Vested or expected to vest at the end of the period (in shares)         435,187    
Exercisable at the end of the period (in shares)         435,187    
Weighted average exercise price              
Outstanding at the beginning of the period (in dollars per share)       $ 15.73 $ 15.73    
Exercised (in dollars per share)         5.85    
Forfeited (in dollars per share)         13.82    
Expired (in dollars per share)         16.02    
Outstanding at the end of the period (in dollars per share)         14.71 $ 15.73  
Vested or expected to vest at the end of the period (in dollars per share)         14.71    
Exercisable at the end of the period (in dollars per share)         $ 14.71    
Weighted average remaining contractual life (in years)              
Outstanding at the end of the period         4 years 3 months 20 days    
Vested or expected to vest at the end of the period         4 years 3 months 20 days    
Exercisable at the end of the period         4 years 3 months 20 days    
Aggregate intrinsic value (in dollars)              
Outstanding at the end of the period (in dollars)         $ 66,000    
Vested or expected to vest at the end of the period (in dollars)         66,000    
Exercisable at the end of the period (in dollars)         $ 66,000    
Range of assumptions used in estimating fair value of options              
Risk-free interest rates, minimum         1.22% 1.00% 1.46%
Risk-free interest rates, maximum         1.95% 1.61% 1.75%
Weighted average volatility         51.10% 54.80% 54.30%
Weighted average grant-date fair value              
Stock-based compensation (in dollars) $ 1,600,000            
Stock options | Sales and marketing [Member] | Restatement Adjustment [Member]              
Weighted average grant-date fair value              
Stock-based compensation (in dollars)       $ (1,000,000)      
RSA              
Change in unvested restricted stock awards              
Unvested balance at the beginning of the period (in shares)       2,030,028 2,030,028    
Granted (in shares)         1,763,912    
Converted (in period)         95,834    
Vested (in shares)         2,080,179    
Forfeited (in shares)         (113,013)    
Unvested balance at the end of the period (in shares)         1,696,582 2,030,028  
Weighted average grant-date fair value              
Unvested balance at the end of the period (in dollars per share)       $ 9.69 $ 9.69    
Granted (in dollars per share)         6.77    
Converted (in dollars per share)         9.44    
Vested (in dollars per share)         8.93    
Forfeited (in dollars per share)         8.80    
Unvested balance at end of the period (in dollars per share)         $ 7.68 $ 9.69  
Total fair value of restricted stock awards, restricted stock units, performance-based stock awards and performance-based stock units on date vested         $ 19,100,000 $ 10,100,000 $ 8,500,000
Restricted Stock Awards [Member]              
Change in unvested restricted stock awards              
Unvested balance at the beginning of the period (in shares)       110,219 110,219    
Granted (in shares)         0    
Vested (in shares)         80,374    
Forfeited (in shares)         (11,913)    
Unvested balance at the end of the period (in shares)         17,932 110,219  
Weighted average grant-date fair value              
Unvested balance at the end of the period (in dollars per share)       $ 11.95 $ 11.95    
Granted (in dollars per share)         0.00    
Vested (in dollars per share)         7.06    
Forfeited (in dollars per share)         8.66    
Unvested balance at end of the period (in dollars per share)         $ 6.99 $ 11.95  
PSAs              
Change in unvested restricted stock awards              
Unvested balance at the beginning of the period (in shares)       147,085 147,085    
Granted (in shares)   131,250 131,250   165,000    
Converted (in period)         (95,834)    
Vested (in shares)         145,357    
Forfeited (in shares)         (10,060)    
Unvested balance at the end of the period (in shares)         60,834 147,085  
Weighted average grant-date fair value              
Unvested balance at the end of the period (in dollars per share)       $ 12.11 $ 12.11    
Granted (in dollars per share)         8.45    
Converted (in dollars per share)         9.44    
Vested (in dollars per share)         9.44    
Forfeited (in dollars per share)         11.87    
Unvested balance at end of the period (in dollars per share)         $ 9.65 $ 12.11  
Total fair value of restricted stock awards, restricted stock units, performance-based stock awards and performance-based stock units on date vested         $ 1,400,000 $ 200,000 $ 600,000
Amended 2007 Plan              
Weighted average grant-date fair value              
Shares available for future issuance (in shares)         5,359,243    
ESPP [Member]              
Weighted average grant-date fair value              
Maximum shares per employee         500    
Number of shares authorized         5,000,000    
Shares available for future issuance (in shares)         1,431,513    
GENBAND | Stock options              
Weighted average grant-date fair value              
Stock-based compensation (in dollars)         $ 8,600,000