Stockholders' Equity - Stock Options and Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2021	Sep. 30, 2020	Dec. 31, 2020
Warrants, Number of Shares [Roll Forward]
Warrants, Outstanding, Beginning of Period (in shares)	2,638,355
Warrants, Granted (in shares)	19,519,393
Warrants, Exercised (in shares)	(801,148)
Warrants, Forfeited (in shares)	0
Warrants, Expired (in shares)	0
Warrants, Outstanding, End of Period (in shares)	21,356,600
Warrants Weighted Average Exercise Price [Roll Forward]
Warrants Outstanding, Beginning of Period (in dollars per share)	$ 2.18
Warrants, Granted (in dollars per share)	2.90
Warrants, Exercised (in dollars per share)	2.19
Warrants, Forfeited (in dollars per share)	0
Warrants, Expired (in dollars per share)	0
Warrants Outstanding, End of Period (in dollars per share)	$ 2.84
Warrants, Outstanding, Weighted Average Remaining Contractual Term	4 years 11 months 23 days	4 years 11 months 23 days
Warrants Outstanding, Aggregate Intrinsic Value	$ 0		$ 0
Warrants, Vested and expected to vest (in shares)	21,356,600
Weighted Average Exercise Price, Warrants Vested And Expected To Vest	$ 2.84
Warrants, Vested and expected to vest, Weighted Average Remaining Contractual Term	4 years 11 months 23 days
Warrants, Vested and expected to vest, Aggregate Intrinsic Value	$ 0
Warrants, Vested (in shares)	21,356,600
Warrants, Vested, Weighted Average Exercise Price (in dollars per share)	$ 2.80
Warrants, Vested, Weighted Average Remaining Contractual Term	4 years 11 months 23 days
Warrants, Vested, Aggregate Intrinsic Value	$ 0
US Equity Plan [Member]
Options, Outstanding [Roll Forward]
Options, Outstanding, Beginning of Period (in shares)	963,700
Options, Granted (in shares)	155,150
Options, Exercised (in shares)	(7,250)
Options, Forfeited (in shares)	(7,017)
Options, Expired (in shares)	(82,359)
Options, Outstanding, End of Period (in shares)	1,022,224
Options, Outstanding, Weighted Average Exercise Price [Abstract]
Options, Outstanding. Beginning of Period (in dollars per share)	$ 14.64
Options, Granted (in dollars per share)	1.60
Options, Exercised (in dollars per share)	3.28
Options, Forfeited (in dollars per share)	2.20
Options, Expired (in dollars per share)	6.54
Options, Outstanding, End of Period (in dollars per share)	$ 13.48
Options, Outstanding, Weighted Average Remaining Contractual Term	6 years 8 months 1 day	5 years 10 months 9 days
Options, Outstanding, Aggregate Intrinsic Value	$ 0		$ 0
Options, Vested and expected to vest (in shares)	996,573
Options, Vested and expected to vest, Weighted Average Exercise Price (in dollars per share)	$ 13.77
Options, Vested and expected to vest, Weighted Average Remaining Contractual Term	6 years 7 months 6 days
Options, Vested and expected to vest, Aggregate Intrinsic Value	$ 0
Options, Vested (in shares)	765,479
Options, Vested, Weighted Average Exercise Price (in dollars per share)	$ 17.08
Options, Vested, Weighted Average Remaining Contractual Term	5 years 10 months 13 days
Options, Vested, Aggregate Intrinsic Value	$ 0