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STOCKHOLDERS' EQUITY (Tables)
 6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Option, Activity
Information with respect to the Company’s option shares granted under all of our stock incentive plans for the six months ended June 30, 2021 was as follows:
 Total Number of OptionsWeighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual
Term (years)		Aggregate
Intrinsic
Value
(in thousands)
Options outstanding at January 1, 2021246,000 $7.48  
Granted— —  
Exercised(246,000)7.48  
Forfeited or canceled— —  
Options outstanding at June 30, 2021— $—0.00$—
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity Information with respect to the Company’s non-vested restricted stock units for the six months ended June 30, 2021 was as follows:
 Number of Restricted Stock UnitsWeighted-
Average
Grant-Date
Fair Value		Weighted-
Average
Remaining
Contractual
Term (years)		Aggregate
Intrinsic
Value
(in thousands)		Shares Retained to Cover Statutory Minimum Withholding Taxes
Non-vested at January 1, 20212,114,879 $7.01  — 
Granted438,295 29.02  — 
Vested(1,003,933)6.69  (316,222)
Forfeited(33,683)7.25  — 
Outstanding at June 30, 20211,515,558 $13.570.98$59,319
Information with respect to the Company’s non-vested performance-based restricted stock units for the six months ended June 30, 2021 was as follows:
 Number of Performance-based Restricted Stock UnitsWeighted-
Average
Grant-Date
Fair Value		Weighted-
Average
Remaining
Contractual
Term (years)		Aggregate
Intrinsic
Value
(in thousands)		Shares Retained to Cover Statutory Minimum Withholding Taxes
Non-vested at January 1, 2021653,428 $6.74  — 
Granted397,048 15.07  — 
Vested(471,112)5.81  (196,703)
Forfeited— —  — 
Non-vested at June 30, 2021579,364 $13.201.30$22,676
Share-based Payment Arrangement, Expensed and Capitalized, Amount
Stock-based compensation was included in the following captions in the Company’s condensed consolidated statements of operations for the three and six months ended June 30, 2021 and 2020 (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Share-based compensation expense by type:
Time-based Restricted Stock Units$2,584 $1,951 $5,021 $3,517 
Performance-based Restricted Stock Units966 748 1,622 1,265 
ESPP30 27 59 53 
Total share-based compensation expense$3,580 $2,726 $6,702 $4,835 

Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Cost of products revenues$150 $118 $291 $220 
Cost of services revenues328 158 627 256 
Research and development expenses409 359 930 653 
Marketing and selling expenses617 581 1,219 1,022 
General and administrative expenses2,076 1,510 3,635 2,684 
Total share-based compensation expense$3,580 $2,726 $6,702 $4,835