Balance Sheet Parenthetical (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Restricted investments	$ 430	$ 430
Allowances for accounts receivable	4	35
Accumulated depreciation and amortization, property and equipment	$ 17,833	$ 36,274
Preferred stock, par value per share	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value per share	$ 0.001	$ 0.001
Common stock, shares authorized	225,000	128,571
Treasury stock, shares	237	183
Common Stock
Common stock, shares issued	103,860	103,663