CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net cash used in operating activities (Note 17)	$ (27,878)	$ (36,641)
Cash flows from (used in) investing activities:
Sale of available-for-sale investments	198	49
Proceeds from sale of assets	4,217	5,061
Additions to property, plant and equipment	(1,797)	(9,620)
Net cash used in investing activities	2,618	(4,510)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issue costs		36,908
Net cash provided by financing activities		36,908
Net increase (decrease) in cash and cash equivalents	(25,260)	(4,243)
Cash and cash equivalents, beginning of period	44,406	48,649
Cash and cash equivalents, end of period	$ 19,146	$ 44,406