Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses And Other Current Liabilities (Details)

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Accrued Expenses And Other Current Liabilities (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Accrued Liabilities and Other Liabilities [Abstract]    
Sales returns and allowances $ 4,374,892 $ 3,829,030
Compensation and benefits 1,096,107 1,401,514
General and administrative 1,042,952 1,001,454
Royalties payable 755,641 743,010
Research and development expenses 236,279 299,480
Other 233,398 256,634
Total accrued expenses and other current liabilities $ 7,739,269 $ 7,531,122