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STOCKHOLDERS' EQUITY Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
Share-based Compensation, Stock Options, Activity [Table Text Block]
Information with respect to option shares granted under all of our stock incentive plans for the three months ended March 31, 2018 was as follows:
 
Time-Based Shares
Performance-Based Shares
Total Shares
Weighted-
Average
Exercise
Price
Weighted-
Average
Remaining
Contractual
Term (years)
Aggregate
Intrinsic
Value
(in thousands)
Options outstanding at January 1, 2018
2,290,017

—

2,290,017

$9.65
 
 
Granted
—

—

—

$—
 
 
Exercised
—

—

—

$—
 
 
Forfeited or canceled
(28,490
)
—

(28,490
)
$21.55
 
 
Options outstanding at March 31, 2018
2,261,527

—

2,261,527

$9.50
1.18
$—
Options vested at March 31, 2018 or expected to vest
 
 
2,261,527

$9.50
1.08
$—
Options exercisable at March 31, 2018
 
 
2,261,527

$9.50
1.18
$—
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
Information with respect to our non-vested restricted stock units for the three months ended March 31, 2018 was as follows:
 
Non-Vested Restricted Stock Units
 
Time-Based Shares
Performance-Based Shares
Total Shares
Weighted-
Average
Grant-Date
Fair Value
Weighted-
Average
Remaining
Contractual
Term (years)
Aggregate
Intrinsic
Value
(in thousands)
Non-vested at January 1, 2018
1,809,138

1,254,110

3,063,248

$5.10
 
 
Granted
803,159

732,884

1,536,043

$4.55
 
 
Vested
(222,232
)
—

(222,232
)
$5.62
 
 
Forfeited
(448,001
)
(757,247
)
(1,205,248
)
$5.33
 
 
Non-vested at March 31, 2018
1,942,064

1,229,747

3,171,811

$4.71
1.26
$14,368
Expected to vest
 
 
2,674,948

$4.88
1.26
$12,118
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
Stock-based compensation was included in the following captions in our condensed consolidated statements of operations for the three months ended March 31, 2018 and 2017 (in thousands):
 
Three Months Ended March 31,
 
2018

2017
Cost of products revenues
$
19

 
$
15

Cost of services revenues
34

 
49

Research and development expenses
152

 
88

Marketing and selling expenses
360

 
356

General and administrative expenses
138

 
903

 
$
703

 
$
1,411