Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current Assets:
Accounts receivable, allowance for doubtful accounts	$ 33	$ 42
Shareholders' Equity:
Common stock, shares authorized	480,000,000	480,000,000
Common stock, shares, issued	122,904,368	122,770,217
Common stock, shares outstanding	122,904,368	122,770,217