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Selected Quarterly Financial Data
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data
Selected Quarterly Financial Data (Unaudited) 
 
For the Quarter Ended
(Dollars in thousands, except per share amounts)
March 31,
2015
 
June 30,
2015
 
Sept. 30,
2015
 
Dec. 31,
2015
Total revenues
$
47,126

 
$
48,611

 
$
49,905

 
$
50,151

Gross profit
29,900

 
30,460

 
31,740

 
31,499

Net loss
(8,165
)
 
(9,310
)
 
(8,829
)
 
(8,549
)
Net loss per share, basic and diluted
(0.11
)
 
(0.12
)
 
(0.12
)
 
(0.11
)
 
For the Quarter Ended
(Dollars in thousands, except per share amounts)
March 31,
2014
 
June 30,
2014
 
Sept. 30,
2014
 
Dec. 31,
2014
Total revenues
$
41,029

 
$
43,375

 
$
46,600

 
$
47,689

Gross profit
25,574

 
26,735

 
29,365

 
30,346

Net loss
(17,324
)
 
(14,630
)
 
(12,109
)
 
(12,090
)
Net loss per share, basic and diluted
(0.25
)
 
(0.21
)
 
(0.17
)
 
(0.17
)


Net loss per share of common stock for the four quarters of each year in the table above may not sum to the total for each year because of the different number of weighted-average shares outstanding in each respective period.