Fair Value Disclosure (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair value
Assets	$ 455
Liabilities	455	$ 11,868
Stock option liability
Fair value
Liabilities	455
Warrants
Fair value
Liabilities		11,868
Deferred charge related to stock options
Fair value
Assets	455
Level 2
Fair value
Assets	455
Liabilities	455
Level 2 | Stock option liability
Fair value
Liabilities	455
Level 2 | Deferred charge related to stock options
Fair value
Assets	$ 455
Level 3
Fair value
Liabilities		11,868
Level 3 | Warrants
Fair value
Liabilities		$ 11,868