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Selected Quarterly Information - $ / shares
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Diluted (in dollars per share) $ 0.19 $ 0.06 $ (0.05) $ (0.08) $ (0.12) $ (0.10) $ (0.08) $ 0.02 $ 0.12 $ (0.28) $ (0.63)
SELECTED QUARTERLY INFORMATION (UNAUDITED)                
SELECTED QUARTERLY INFORMATION (UNAUDITED)
The following tables summarize the Company's quarterly results of operations for the years ended December 31, 2019 and 2018 (in thousands, except per share amounts):
 
Three Months Ended,
 
March 31,
2019
 
June 30,
2019
 
September 30,
2019
 
December 31,
2019
Revenue
$
31,574

 
$
31,932

 
$
31,678

 
$
34,775

Gross profit
24,045

 
24,836

 
24,427

 
27,643

(Loss) income from operations
(2,300
)
 
(1,414
)
 
1,781

 
5,735

Net (loss) income
(2,329
)
 
(1,338
)
 
1,729

 
5,420

Net (loss) income per share:
 
 
 
 
 
 
 
Basic
$
(0.08
)
 
$
(0.05
)
 
$
0.06

 
$
0.19

Diluted
$
(0.08
)
 
$
(0.05
)
 
$
0.06

 
$
0.19

 
Three Months Ended,
 
March 31,
2018
 
June 30,
2018
 
September 30,
2018
 
December 31,
2018
Revenue
$
31,445

 
$
32,660

 
$
32,324

 
$
34,789

Gross profit
24,092

 
25,685

 
24,718

 
27,222

(Loss) income from operations
(3,151
)
 
(2,734
)
 
(2,241
)
 
620

Net (loss) income
(3,157
)
 
(2,764
)
 
(2,287
)
 
607

Net (loss) income per share:
 
 
 
 
 
 
 
Basic
$
(0.12
)
 
$
(0.10
)
 
$
(0.08
)
 
$
0.02

Diluted
$
(0.12
)
 
$
(0.10
)
 
$
(0.08
)
 
$
0.02