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Quarterly Result of Operations (Unaudited)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Result of Operations (Unaudited) QUARTERLY RESULT OF OPERATIONS (UNAUDITED)
Quarter ended
 
March 31,
2018
 
June 30,
2018
 
September 30,
2018
 
December 31,
2018
Sales(1)
 
$
92,834

 
$
98,244

 
$
99,705

 
$
112,844

Gross profit(2)
 
53,786

 
57,691

 
52,317

 
64,551

Net income (loss)(3)
 
455

 
1,205

 
(2,488
)
 
5,758

Net income (loss) per share:
 
 
 
 
 
 
 
 
Basic
 
$
0.03

 
$
0.07

 
$
(0.15
)
 
$
0.33

Diluted
 
$
0.03

 
$
0.07

 
$
(0.15
)
 
$
0.33

(1) 
For the fourth quarter of 2018, sales were reduced by a $4.8 million estimated cumulative sales adjustment, representative of the last six years of estimated overcharges to the Government under the GSA Contracts.
(2) 
For the third quarter of 2018, gross profit was reduced by a $4.7 million inventory reserve charge resulting from an analysis of our inventory reserves in connection with our new product introductions and acquisitions, which increased our reserve for excess and obsolete inventory.
(3) 
For the fourth quarter of 2018, as additional guidance was released during the SAB 118 remeasurement period related to the U.S. Tax Reform, we completed our transition tax analysis, which resulted in an income tax benefit of $1.0 million.

Quarter ended
 
March 31, 2017
 
June 30,
2017
 
September 30, 2017
 
December 31, 2017
Sales
 
$
81,562

 
$
82,682

 
$
90,250

 
$
106,423

Gross profit
 
43,749

 
46,760

 
52,034

 
62,094

Net (loss) income(1)
 
(1,461
)
 
(3,625
)
 
1,628

 
(11,058
)
Net (loss) income per share:
 
 
 
 
 
 
 
 
Basic
 
$
(0.09
)
 
$
(0.22
)
 
$
0.10

 
$
(0.66
)
Diluted
 
$
(0.09
)
 
$
(0.22
)
 
$
0.10

 
$
(0.66
)

(1) 
For the fourth quarter of 2017, $19.4 million of additional income tax expense was recorded pursuant to the U.S. Tax Reform. $17.4 million of this expense related to a provisional amount of transition tax on the mandatory deemed repatriation of foreign earnings. $2.0 million of this expense related to the remeasurement of our deferred tax assets and liabilities.