Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 0	$ 3
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	75,000,000	30,000,000
Common stock, shares issued	28,677,000	21,222,000
Common stock, shares outstanding	28,677,000	21,222,000