Debt - Securities Purchase Agreement (Details) - USD ($)						1 Months Ended		3 Months Ended	12 Months Ended
	Apr. 17, 2019	Aug. 02, 2018	Mar. 21, 2018	Feb. 26, 2018	Dec. 08, 2017	Apr. 30, 2019	Mar. 31, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Debt
Proceeds from issuance of short-term notes payable										$ 5,050,000
Maximum aggregate redemption amount		$ 500,000
Loss on extinguishment of debt									$ 1,864,000	4,941,000
Change in warrant liability									$ 2,696,000	(1,010,000)
March 2018 note payable | Chicago Venture Partners, L.P.
Debt
Aggregate purchase price			$ 750,000
Securities Purchase Agreement | Promissory Note, December 08, 2017 | Chicago Venture Partners, L.P.
Debt
Principal amount					$ 1,600,000
Aggregate purchase price					1,100,000
Original issue discount					463,000
Transaction expenses					$ 25,000
Interest rate (as a percent)					8.00%
Maximum aggregate redemption amount		$ 500,000
Repayments of notes payable, principal							$ 811,000
Repayments of notes payable, interest							179,000
Loss on extinguishment of debt	$ 19,000					$ 100,000	243,000			$ 363,061
Securities Purchase Agreement | February 2018 note payable | Chicago Venture Partners, L.P.
Debt
Principal amount				$ 2,200,000
Aggregate purchase price				1,600,000
Original issue discount				656,000
Transaction expenses				$ 25,000
Interest rate (as a percent)				8.00%
Repayments of notes payable, principal							2,000,000
Repayments of notes payable, interest							204,000
Loss on extinguishment of debt						$ 38,000	$ 488,000
Securities Purchase Agreement | March 2018 note payable | Chicago Venture Partners, L.P.
Debt
Principal amount			1,100,000
Original issue discount			315,000
Transaction expenses			$ 25,000
Interest rate (as a percent)			8.00%
Repayments of notes payable, principal								$ 1,100,000
Repayments of notes payable, interest								86,000
Loss on extinguishment of debt								$ 1,200,000