Loan and Security Agreement - Outstanding Debt and Unamortized Debt Discount (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Total Outstanding Debt	$ 20,000,000		$ 20,000,000		$ 20,000,000
Add: accreted liability of final payment fee	642,392		642,392		404,364
Less: unamortized debt discount, long-term	(231,404)		(231,404)		(405,071)
Less: current portion of long-term debt	(6,666,667)		(6,666,667)		(2,666,667)
Loan payable, long-term	13,744,321		13,744,321		17,332,626
Current portion of long-term debt	6,666,667		6,666,667		2,666,667
Current portion of unamortized debt discount	(119,406)		(119,406)		(64,375)
Loan payable, current portion	6,547,261		6,547,261		$ 2,602,292
Amortization of debt discount			356,664	$ 294,818
Warrants
Amortization of debt discount	$ 59,998	$ 61,126	$ 118,636	$ 98,894