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STOCKHOLDERS' EQUITY (Tables)
9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Option, Activity
Information with respect to option shares granted under all of our stock incentive plans for the nine months ended September 30, 2020 was as follows:
 Time-Based SharesPerformance-Based SharesTotal SharesWeighted-
Average
Exercise
Price
Weighted-
Average
Remaining
Contractual
Term (years)
Aggregate
Intrinsic
Value
(in thousands)
Options outstanding at January 1, 2020565,000 — 565,000 $7.57  
Granted— — — $—  
Exercised(175,355)— (175,355)$7.73  
Forfeited or canceled— — — $—  
Options outstanding at September 30, 2020389,645 — 389,645 $7.510.54$413
Options vested at September 30, 2020 or expected to vest389,645 $7.510.54$413
Options exercisable at September 30, 2020389,645 $7.510.54$413
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
Information with respect to our non-vested restricted stock units for the nine months ended September 30, 2020 was as follows:
 Non-Vested Restricted Stock Units
 Time-Based SharesPerformance-Based SharesTotal SharesWeighted-
Average
Grant-Date
Fair Value
Weighted-
Average
Remaining
Contractual
Term (years)
Aggregate
Intrinsic
Value
(in thousands)
Non-vested at January 1, 20202,087,933 554,265 2,642,198 $6.40  
Granted1,424,480 578,316 2,002,796 $6.92  
Vested(991,552)(328,673)(1,320,225)$6.23  
Forfeited(104,473)— (104,473)$7.16  
Non-vested at September 30, 20202,416,388 803,908 3,220,296 $6.771.03$27,534
Expected to vest3,220,296 $6.771.03$27,534
Share-based Payment Arrangement, Expensed and Capitalized, Amount
Stock-based compensation was included in the following captions in our condensed consolidated statements of operations for the nine months ended September 30, 2020 and 2019 (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
Cost of products revenues$150 $103 $370 $244 
Cost of services revenues283 82 539 177 
Research and development expenses546 305 1,199 762 
Marketing and selling expenses739 532 1,761 1,276 
General and administrative expenses1,579 1,023 4,263 3,329 
 $3,297 $2,045 $8,132 $5,788