Long-Term Debt - Schedule of Debt and Unamortized Discount Balances (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt	$ 18,621,696		$ 18,621,696		$ 9,029,374
Non-cash interest expense related to debt discount amortization and accretion	79,388	$ 48,461	128,518	$ 69,791
MidCap Financial CSA
Debt Instrument [Line Items]
Term loan face value	10,000,000		10,000,000
Fair value of warrant	(176,813)		(176,813)
End of term charge	(400,000)		(400,000)
Capitalized debt issuance costs	(499,354)		(499,354)
Accretion of debt issuance costs and end of term charge	87,859		87,859
Accretion of warrant fair value	17,682		17,682
Balance	9,029,374		9,029,374
Less current portion	0		0
Long-term debt	9,029,374		9,029,374
Innovatus LSA
Debt Instrument [Line Items]
Term loan face value	20,000,000		20,000,000
Fair value of warrant	(629,830)		(629,830)
Stock discount issued	(201,789)		(201,789)
End of term charge	(750,000)		(750,000)
Capitalized debt issuance costs	(792,597)		(792,597)
Interest payment-in-kind	166,524		166,524
Accretion of debt issuance costs and end of term charge	79,388		79,388
Balance	18,621,696		18,621,696
Less current portion	0		0
Long-term debt	$ 18,621,696		$ 18,621,696