Fair Value Measurements - Schedule of Changes in Fair Value Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Balance January 1	$ 64,687	$ 1,437
Additional warrant liability		14,698
Additional derivative liability from issuance of convertible notes	17,882	15,817
Extinguishment of warrant liabilities related to warrants exercise	(1,256)
Extinguishment of derivative liabilities related to debt conversion and repayment	(40,862)	(2,634)
Change in fair value	(28,855)	35,369
Balance December 31	11,596	64,687
Warrant Derivative Liability [Member]
Balance January 1	16,492	1,437
Additional warrant liability		14,698
Additional derivative liability from issuance of convertible notes
Extinguishment of warrant liabilities related to warrants exercise	(1,256)
Extinguishment of derivative liabilities related to debt conversion and repayment
Change in fair value	(11,678)	357
Balance December 31	3,558	16,492
Debt Derivative Liability [Member]
Balance January 1	48,195
Additional warrant liability
Additional derivative liability from issuance of convertible notes	17,882	15,817
Extinguishment of warrant liabilities related to warrants exercise
Extinguishment of derivative liabilities related to debt conversion and repayment	(40,862)	(2,634)
Change in fair value	(17,177)	35,012
Balance December 31	$ 8,038	$ 48,195