Accrued Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017		Mar. 31, 2017
Schedule of Accrued Liabilities [Line Items]
Capital expenditures	$ 3,054	$ 1,947
Interest expense	1,587	240
Payroll	1,575	1,580
Professional fees	1,013	546
Clinical studies	905	596
Royalties	893	856		$ 500
Medicaid and Medicare	868	0
Rebates	314	0
Wholesaler fees	104	7,044
Income Tax	38	58
Other	787	635
Accrued expenses	11,138	$ 13,502	[1]
Accounting Standards Update 2014-09
Schedule of Accrued Liabilities [Line Items]
Wholesale fees	4,400
Accounts receivable and medicaid fees	700
Medicare fees	100
Rebates	$ 300

[1] Derived from the audited December 31, 2017 financial statements