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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Schedule of Sales Allowances and Accruals
The following table provides a summary of activity with respect to the Company’s sales allowances and accruals during 2017, 2016 and 2015 (amounts in thousands):
 
Cash
Discounts
 
Returns
 
Chargebacks
 
Rebates
 
Fees-for-
Service
Balance at January 1, 2015
$
4,142

 
$
3,349

 
$
44,399

 
$
—

 
$
924

Allowances for sales during 2015
9,212

 
12,143

 
107,564

 
833

 
14,249

Actual credits issued for prior year’s sales
(3,927
)
 
(3,528
)
 
(40,419
)
 
—

 
(1,179
)
Actual credits issued for sales during 2015
(8,540
)
 
(3,221
)
 
(95,828
)
 
(733
)
 
(11,314
)
Balance at December 31, 2015
887

 
8,743

 
15,716

 
100

 
2,680

Allowances for sales during 2016
1,854

 
(1,424
)
 
36,197

 
(6
)
 
3,166

Actual credits issued for prior year’s sales
(887
)
 
(5,233
)
 
(15,610
)
 
(50
)
 
(2,655
)
Actual credits issued for sales during 2016
(1,573
)
 
(502
)
 
(34,408
)
 
(29
)
 
(2,365
)
Balance at December 31, 2016
281

 
1,584

 
1,895

 
15

 
826

Allowances for sales during 2017
1,746

 
4,439

 
17,395

 
271

 
3,085

Actual credits issued for prior year’s sales
(281
)
 
(1,464
)
 
(1,246
)
 
(15
)
 
(865
)
Actual credits issued for sales during 2017
(775
)
 
(220
)
 
(12,172
)
 
(126
)
 
(2,152
)
Balance at December 31, 2017
$
971

 
$
4,339

 
$
5,872

 
$
145

 
$
894