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Selected Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
Consolidated Statement of Operations Data: 
 
March 31, 2015
 
June 30, 2015
 
September 30, 2015
 
December 31, 2015
 
 
(In thousands)
Revenue
 
$
66,306

 
$
68,975

 
$
69,588

 
$
71,284

Gross profit
 
$
47,753

 
$
49,643

 
$
50,284

 
$
52,507

Loss from operations
 
$
(6,401
)
 
$
(7,375
)
 
$
(4,723
)
 
$
(4,699
)
Net loss
 
$
(9,352
)
 
$
(8,491
)
 
$
(6,561
)
 
$
(5,980
)
Net loss per common share (1)
 
 
 
 
 
 
 
 
Basic
 
$
(0.17
)
 
$
(0.15
)
 
$
(0.11
)
 
$
(0.10
)
Diluted
 
$
(0.17
)
 
$
(0.15
)
 
$
(0.11
)
 
$
(0.10
)
Consolidated Statement of Operations Data: 
 
March 31, 2014
 
June 30, 2014
 
September 30, 2014
 
December 31, 2014
 
 
(In thousands)
Revenue
 
$
59,241

 
$
63,557

 
$
65,605

 
$
67,418

Gross Profit
 
$
42,239

 
$
46,474

 
$
48,523

 
$
49,237

Loss from operations
 
$
(6,193
)
 
$
(6,963
)
 
$
(3,923
)
 
$
(4,655
)
Net loss
 
$
(5,379
)
 
$
(5,673
)
 
$
(4,351
)
 
$
(11,093
)
Net loss per common share (1)
 
 
 
 
 
 
 
 
Basic
 
$
(0.10
)
 
$
(0.10
)
 
$
(0.08
)
 
$
(0.20
)
Diluted
 
$
(0.10
)
 
$
(0.10
)
 
$
(0.08
)
 
$
(0.20
)
(1) Quarterly per share amounts may not add to the related annual per share amount because of differences in the average common shares outstanding during each period.