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STOCKHOLDERS' EQUITY Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Allocated Share-based Compensation Expense $ 1,552 $ 1,982 $ 2,255 $ 3,393  
Cost of Products Revenues [Member]          
Allocated Share-based Compensation Expense 24 10 43 25  
Cost of Services Revenues [Member]          
Allocated Share-based Compensation Expense 50 410 84 459  
Research and Development Expense [Member]          
Allocated Share-based Compensation Expense 51 164 203 252  
Selling and Marketing Expense [Member]          
Allocated Share-based Compensation Expense 373 437 733 793  
General and Administrative Expense [Member]          
Allocated Share-based Compensation Expense $ 1,054 $ 961 $ 1,192 $ 1,864  
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 942,977   942,977   2,290,017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 8.49   $ 8.49   $ 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     (1,347,040)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price     $ 10.47    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term     2 years 40 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 942,977   942,977    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 8.49   $ 8.49    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term     2 years 40 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 942,977   942,977    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 8.49   $ 8.49    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term     2 years 40 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 942,977   942,977   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     (1,347,040)    
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 2,676,717   2,676,717   3,063,248
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 4.73   $ 4.73   $ 5.10
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms     1 year 75 days    
Share-based Compensation Arrangement by Share-based Payment Award, Non-vested Restricted Stock Aggregate Intrinsic Value $ 13,892   $ 13,892    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     1,951,590    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 4.63    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     (437,570)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     $ 5.63    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (1,900,551)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 5.02    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected to Vest Number 2,356,699   2,356,699    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Weighted Average Grant Date Fair Value $ 4.85   $ 4.85    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected to Vest Weighted Average Remaining Contractual Term     1 year 75 days    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Intrinsic Value $ 12,231   $ 12,231    
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 1,748,814   1,748,814   1,809,138
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     1,218,706    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     (437,570)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (841,460)    
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 927,903   927,903   1,254,110
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     732,884    
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)