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STOCK-BASED COMPENSATION PLANS (Tables)
 9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of activity related to outstanding stock options
The activity related to the Company's outstanding stock options for the nine months ended September 30, 2020 was as follows:
Number of
Shares		Weighted
Average
Exercise Price		Weighted
Average
Remaining
Contractual Term
(years)		Aggregate
Intrinsic Value
(in thousands)
Outstanding at January 1, 2020297,124 $11.55 
Granted— $— 
Exercised(16,128)$1.77 
Forfeited(6,055)$2.78 
Expired(41,717)$15.78 
Outstanding at September 30, 2020233,224 $11.70 4.10$157 
Vested or expected to vest at September 30, 2020232,800 $11.71 4.10$157 
Exercisable at September 30, 2020224,173 $12.09 4.00$140 
Schedule of stock options, additional information Additional information regarding the Company's stock options for the nine months ended September 30, 2020 was as follows (in thousands):
Three months endedNine months ended
September 30,
2020		September 30,
2020
Total intrinsic value of stock options exercised$7 $36 
Cash received from the exercise of stock options$6 $29 
Schedule of activity related to unvested restricted stock grants
The activity related to the Company's RSAs for the nine months ended September 30, 2020 was as follows:
SharesWeighted
Average
Grant Date
Fair Value
Unvested balance at January 1, 2020487,976 $6.87 
Granted— $— 
Vested(304,441)$6.80 
Forfeited(27,484)$6.97 
Unvested balance at September 30, 2020156,051 $7.00 


The activity related to the Company's RSUs for the nine months ended September 30, 2020 was as follows:
SharesWeighted
Average
Grant Date
Fair Value
Unvested balance at January 1, 20202,790,060 $5.11 
Granted6,486,016 $2.93 
Vested(1,667,289)$4.75 
Forfeited(677,124)$3.69 
Unvested balance at September 30, 20206,931,663 $3.30 
Schedule of activity related to performance stock awards
The activity related to the Company's PSUs for the nine months ended September 30, 2020 was as follows:
SharesWeighted
Average
Grant Date
Fair Value
Unvested balance at January 1, 20201,067,073 $5.94 
Granted5,804,202 $1.44 
Vested(323,752)$5.52 
Forfeited(377,753)$5.22 
Unvested balance at September 30, 20206,169,770 $1.67 
Schedule of stock-based compensation expenses which are included in condensed consolidated statement of operations
The condensed consolidated statements of operations include stock-based compensation for the three and nine months ended September 30, 2020 and 2019 as follows (in thousands):
 Three months endedNine months ended
 September 30,
2020		September 30,
2019		September 30,
2020		September 30,
2019
Product cost of revenue$57 $26 $123 $62 
Service cost of revenue204 124 493 367 
Research and development868 521 2,164 1,359 
Sales and marketing1,189 721 2,952 2,265 
General and administrative1,651 1,093 4,435 4,101 
$3,969 $2,485 $10,167 $8,154