Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Jan. 31, 2017
Recent Accounting Pronouncements
Operating lease right-of-use assets, net	$ 1,378
Operating lease liability	1,672
Share-based compensation liability	402		$ 3,018
Additional Paid in Capital	$ 183,834		$ 180,862
Accounting Standards Update 2016-02
Recent Accounting Pronouncements
Operating lease right-of-use assets, net				$ 2,300
Operating lease liability				$ 2,300
Accounting Standards Update 2016-02 | Adjustments
Recent Accounting Pronouncements
Operating lease right-of-use assets, net		$ 1,600
Operating lease liability		1,900
Accounting Standards Update 2018-07 | Adjustments
Recent Accounting Pronouncements
Share-based compensation liability		(2,100)
Additional Paid in Capital		$ 2,100