Loan and Security Agreement - Warrants Issued (Details) - USD ($)		1 Months Ended				3 Months Ended	12 Months Ended
	Dec. 05, 2019	Dec. 31, 2019	Sep. 30, 2019	Jan. 31, 2019	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 25, 2019	Mar. 31, 2019	Dec. 31, 2016	Nov. 09, 2016
Exercise price of warrants (in dollars per share)		$ 7.21			$ 5.21	$ 7.21	$ 7.21	$ 6.35	$ 5.21			$ 3.06
Warrants exercised							111,715	101,310	129,149
Shares issued	207,400,000			3,164,015	1,783,587	89,390	942,285
Proceeds from Issuance of Long-term Debt							$ 20,000,000
Warrants issued							58,334	15,750	1,890,602
Amortization of debt discount							$ 649,993	$ 375,635	$ 470,521
Warrants
Amortization of debt discount							$ 213,426	$ 108,968	$ 123,543
Term Loan
Common stock to be issued if warrants are exercised (in shares)													65,228
Exercise price of warrants (in dollars per share)													$ 7.41
Warrants exercised			32,614
Shares issued			24,328
2019 Term Loan
Shares issued		24,185
2019 Term Loan | Warrants
Common stock to be issued if warrants are exercised (in shares)										29,167	70,000
Exercise price of warrants (in dollars per share)											$ 8.10
Warrants exercised		29,167
Term Loan 2019, Tranche Two | Warrants
Common stock to be issued if warrants are exercised (in shares)										5,750
Exercise price of warrants (in dollars per share)										$ 25.71