1-for-4 Reverse Stock Split -(Details) shares in Thousands	12 Months Ended
	Dec. 31, 2016 $ / shares shares	Dec. 31, 2015 $ / shares	May 02, 2012 $ / shares
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Treasury Stock, Shares, Retired | shares	30
Common Stock
Class of Stock [Line Items]
Reverse stock split conversion ratio	0.25
Common stock, par value (in dollars per share)	$ 0.001