Summary of Significant Policies - Schedule of Fair Value of Warrants (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Warrant derivative liability		$ (594)
Fair Value, Inputs, Level 1 [Member]
Warrant derivative liability
Fair Value, Inputs, Level 2 [Member]
Warrant derivative liability
Level 3 [Member]
Warrant derivative liability