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STOCK-BASED COMPENSATION - Stock Options Narrative and Activity (Details) - USD ($)
1 Months Ended 12 Months Ended
May 31, 2014
May 31, 2004
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock-based compensation          
Total unrecognized compensation expense     $ 14,000,000    
Average vesting period for recognition of unrecognized compensation expense     2 years    
Cash received from stock option exercises     $ 1,500,000 $ 7,000,000  
Total     12,585,000 13,016,000 $ 17,172,000
Tax benefit on total stock-based compensation     $ 700,000 $ 400,000 600,000
Shares          
Options granted (in shares)     0    
Options exercised (in shares)     (278,000) (1,000,892)  
Weighted- Average Exercise Price          
Options granted (in dollars per share)     $ 0.00    
Inventory          
Stock-based compensation          
Total     $ 0 $ 0 $ 0
Stock options          
Stock-based compensation          
Weighted-average grant date fair value of awards granted (in dollars per share)     $ 4.32 $ 5.55 $ 6.81
Total intrinsic value of options exercised     $ 600,000 $ 5,000,000 $ 6,600,000
Total fair value of options vested     2,300,000 4,700,000 9,300,000
Cash received from stock option exercises     $ 1,500,000 $ 7,000,000 $ 6,700,000
Stock options | The 2004 Plan          
Stock-based compensation          
Number of shares authorized under plan (in shares)   14,450,000      
Shares available for future issuance (in shares)     0    
Vesting period   4 years      
Shares          
Options outstanding at the beginning of the period (in shares)     1,786,041    
Options exercised (in shares)     (277,443)    
Options forfeited (in shares)     (6,965)    
Options expired (in shares)     (332,221)    
Options outstanding at the end of the period (in shares)     1,169,412 1,786,041  
Options vested and expected to vest at the end of the period (in shares)     1,169,412    
Options exercisable at the end of the period (in shares)     1,169,412    
Weighted- Average Exercise Price          
Options outstanding at the beginning of the period (in dollars per share)     $ 7.62    
Options exercised (in dollars per share)     5.37    
Options forfeited (in dollars per share)     12.69    
Options expired (in dollars per share)     9.56    
Options outstanding at the end of the period (in dollars per share)     7.57 $ 7.62  
Options vested and expected to vest at the end of the period (in dollars per share)     7.57    
Options exercisable at the end of the period (in dollars per share)     $ 7.57    
Weighted- Average Remaining Contractual Term (years)          
Options outstanding at the end of the period     1 year 9 months 11 days    
Options vested and expected to vest at the end of the period     1 year 9 months 11 days    
Options exercisable at the end of the period     1 year 9 months 11 days    
Aggregate Intrinsic Value (in thousands)          
Options outstanding at the end of the period     $ 29,000    
Options vested and expected to vest at the end of the period     29,000    
Options exercisable at the end of the period     $ 29,000    
Stock options | The 2004 Plan | Minimum          
Stock-based compensation          
Awards vesting by the end of the first year, percentage (at least)   25.00%      
Stock options | The 2004 Plan | Maximum          
Stock-based compensation          
Term of awards (may not exceed)   10 years      
Stock options | The 2014 Plan          
Stock-based compensation          
Number of shares authorized under plan (in shares) 12,130,000        
Shares available for future issuance (in shares)     5,751,303    
Vesting period 4 years        
Shares          
Options outstanding at the beginning of the period (in shares)     3,455,769    
Options granted (in shares)     75,304    
Options exercised (in shares)     0    
Options forfeited (in shares)     (1,270,762)    
Options expired (in shares)     (798,842)    
Options outstanding at the end of the period (in shares)     1,461,469 3,455,769  
Options vested and expected to vest at the end of the period (in shares)     1,461,469    
Options exercisable at the end of the period (in shares)     808,141    
Weighted- Average Exercise Price          
Options outstanding at the beginning of the period (in dollars per share)     $ 14.24    
Options granted (in dollars per share)     8.55    
Options exercised (in dollars per share)     0.00    
Options forfeited (in dollars per share)     13.20    
Options expired (in dollars per share)     17.83    
Options outstanding at the end of the period (in dollars per share)     12.90 $ 14.24  
Options vested and expected to vest at the end of the period (in dollars per share)     12.90    
Options exercisable at the end of the period (in dollars per share)     $ 14.30    
Weighted- Average Remaining Contractual Term (years)          
Options outstanding at the end of the period     6 years 9 months    
Options vested and expected to vest at the end of the period     6 years 9 months    
Options exercisable at the end of the period     6 years 15 days    
Aggregate Intrinsic Value (in thousands)          
Options outstanding at the end of the period     $ 0    
Options vested and expected to vest at the end of the period     0    
Options exercisable at the end of the period     $ 0    
Stock options | The 2014 Plan | Minimum          
Stock-based compensation          
Awards vesting by the end of the first year, percentage (at least) 25.00%        
Stock options | The 2014 Plan | Maximum          
Stock-based compensation          
Term of awards (may not exceed) 10 years        
Incentive stock options | The 2004 Plan | Minimum          
Stock-based compensation          
Exercise price of awards as percentage of the fair value of common stock (at least)   100.00%      
Nonstatutory stock options | The 2004 Plan | Minimum          
Stock-based compensation          
Exercise price of awards as percentage of the fair value of common stock (at least)   85.00%      
Restricted stock units | The 2014 Plan          
Stock-based compensation          
Weighted-average grant date fair value of stock purchase rights granted (in dollars per share)     $ 6.84    
ESPP          
Stock-based compensation          
Weighted-average grant date fair value of stock purchase rights granted (in dollars per share)     $ 1.73 $ 2.97 $ 6.09
Number of shares authorized under plan (in shares)     3,000,000    
Shares available for future issuance (in shares)     302,549    
ESPP | Minimum          
Stock-based compensation          
Exercise price of awards as percentage of the fair value of common stock (at least)   85.00%