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STOCKHOLDERS' EQUITY Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Allocated Share-based Compensation Expense $ 2,076 $ 2,481 $ 4,331 $ 5,874  
Cost of Products Revenues [Member]          
Allocated Share-based Compensation Expense 40 14 83 39  
Cost of Services Revenues [Member]          
Allocated Share-based Compensation Expense 55 49 139 508  
Research and Development Expense [Member]          
Allocated Share-based Compensation Expense 236 222 439 474  
Selling and Marketing Expense [Member]          
Allocated Share-based Compensation Expense 419 582 1,152 1,375  
General and Administrative Expense [Member]          
Allocated Share-based Compensation Expense $ 1,326 $ 1,614 $ 2,518 $ 3,478  
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 916,465   916,465   2,290,017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 8.48   $ 8.48   $ 9.65
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     0    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price     $ 0.00    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     0    
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price     $ 0.00    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period     (1,373,552)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price     $ 10.44    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term     1 year 320 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 0   $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 916,465   916,465    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 8.48   $ 8.48    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term     1 year 320 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 0   $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number 916,465   916,465    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 8.48   $ 8.48    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term     1 year 320 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value $ 0   $ 0    
Employee Stock Option [Member] | Time-Based Vesting [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 916,465   916,465   2,290,017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period     (1,373,552)    
Employee Stock Option [Member] | Performance-Based Vesting [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 0   0   0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures     0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period     0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period     0    
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 3,009,417   3,009,417   3,063,248
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 4.90   $ 4.90   $ 5.10
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms     1 year 40 days    
Share-based Compensation Arrangement by Share-based Payment Award, Non-vested Restricted Stock Aggregate Intrinsic Value $ 17,816   $ 17,816    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     2,464,852    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 4.97    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     (600,134)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     $ 5.62    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (1,918,549)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 5.09    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected to Vest Number 2,689,399   2,689,399    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Weighted Average Grant Date Fair Value $ 5.02   $ 5.02    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected to Vest Weighted Average Remaining Contractual Term     1 year 40 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Intrinsic Value $ 15,921   $ 15,921    
Restricted Stock Units (RSUs) [Member] | Time-Based Vesting [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 2,043,274   2,043,274   1,809,138
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     1,693,728    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     (600,134)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (859,458)    
Restricted Stock Units (RSUs) [Member] | Performance-Based Vesting [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 966,143   966,143   1,254,110
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     771,124    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (1,059,091)