Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Accumulated Depreciation	$ 13,870	$ 12,921
Preferred Stock, shares authorized	150,000	150,000
Preferred Stock, shares issued	0	0
Preferred Stock, shares outstanding	0	0
Common Stock, par value
Common Stock, shares authorized	25,000,000	25,000,000
Common Stock, shares issued	19,606,518	16,617,932
Common Stock, shares outstanding	19,606,518	16,617,932