Condensed Consolidated Statements of Changes in Stockholders' Equity - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balances at Dec. 31, 2014	$ 585,318	$ 1,034	$ 2,789,695	$ (2,202,603)	$ (2,808)
Balances, in shares at Dec. 31, 2014		103,384,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(64,185)	$ 0	0	(64,185)	0
Other comprehensive income (loss)	$ (812)	$ 0	0	0	(812)
Common stock issued for the acquisition of Paramount Gold and Silver Corp.	32,667,327	32,667,000
Stock Issued During Period, Value, Acquisitions	$ 188,817	$ 327	188,490	0	0
Common stock issued under stock-based compensation plans, net	5,247	$ 9	5,238	0	0
Common stock issued under stock-based compensation plans, net		911,000
Balances at Sep. 30, 2015	$ 714,385	$ 1,370	$ 2,983,423	$ (2,266,788)	$ (3,620)
Balances, in shares at Sep. 30, 2015		136,962,000