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Warrants - Schedule of Rollforward of Common Stock Warrants Outstanding (Details) - Warrants [Member]
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Number of Warrants, Outstanding, Beginning Balance | shares 18,953,195
Number of Warrants, Warrants issued | shares 5,098,744
Number of Warrants, Warrants exercised | shares (847,184)
Number of Warrants, Pre-funded warrants exercised | shares (300,000)
Number of Warrants, Warrants expired | shares (2,515)
Number of Warrants, Outstanding, Ending Balance | shares 22,902,240
Weighted Average Exercise Price, Outstanding, Beginning balance | $ / shares $ 3.55
Weighted Average Exercise Price, Warrants issued | $ / shares 1.58
Weighted Average Exercise Price, Warrants exercised | $ / shares (1.09)
Weighted Average Exercise Price, Pre-funded warrants exercised | $ / shares (0.01)
Weighted Average Exercise Price, Warrants expired | $ / shares (83.50)
Weighted Average Exercise Price, Outstanding, Ending balance | $ / shares $ 3.23
Weighted Average Remaining Contractual Term (Years), Outstanding, Beginning Balance 4 years 2 months 1 day
Weighted Average Remaining Contractual Term (Years), Outstanding, Ending balance 3 years 2 months 12 days
Aggregate Intrinsic Value, Outstanding, Beginning balance | $
Aggregate Intrinsic Value, Outstanding, Ending balance | $ $ 5,711