Summary of Significant Accounting Policies (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves balance, beginning of year	$ 14,266	$ 5,587	$ 1,960
Provision	169,138	69,712	32,867
Charges processed	(141,493)	(61,033)	(29,240)
Valuation allowances and reserves balance, end of year	41,911	14,266	5,587
Returns
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves balance, beginning of year	934	674	56
Provision	3,568	1,724	767
Charges processed	(2,192)	(1,464)	(149)
Valuation allowances and reserves balance, end of year	2,310	934	674
Chargebacks & Rebates
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves balance, beginning of year	12,450	4,552	1,746
Provision	160,556	65,713	31,040
Charges processed	(137,125)	(57,815)	(28,234)
Valuation allowances and reserves balance, end of year	35,881	12,450	4,552
Discounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves balance, beginning of year	792	345	142
Provision	4,667	2,201	1,060
Charges processed	(2,156)	(1,754)	(857)
Valuation allowances and reserves balance, end of year	3,303	792	345
Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation allowances and reserves balance, beginning of year	90	16	16
Provision	347	74	0
Charges processed	(20)	0	0
Valuation allowances and reserves balance, end of year	$ 417	$ 90	$ 16