Accrued Expenses and Other Noncurrent Liabilities (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accrued compensation	$ 14,788,249	$ 17,937,504
Accrued rebates	2,557,846	2,535,606
Accrued employee benefits	2,966,096	2,809,239
Accrued professional fees	1,196,009	1,837,749
Accrued interest	3,104,615	1,463,880
Deferred rent	581,227	400,809
Other	2,826,415	3,298,275
Total accrued expenses	28,020,457	30,283,062
Other noncurrent liabilities	$ 5,316,566	$ 2,940,435