Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net loss	$ (20,029)	$ (21,605)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	6,870	7,268
Provision for severance benefits	7,260	4,034
Bad debt expenses (reversal of allowance)	(20)	94
Amortization of debt issuance costs and original issue discount	162	149
Loss on foreign currency, net	4,179	11,007
Stock-based compensation	185	617
Other	(222)	367
Changes in operating assets and liabilities
Accounts receivable	133	(28,094)
Inventories, net	(1,701)	(10,028)
Other receivables	6,140	691
Other current assets	(1,653)	(806)
Deferred tax assets	324	366
Accounts payable	5,902	(837)
Other accounts payable	(4,881)	(1,230)
Accrued expenses	(7,626)	(3,273)
Other current liabilities	(1,774)	(1,790)
Other non-current liabilities	(220)	548
Payment of severance benefits	(1,341)	(1,514)
Other	(367)	(150)
Net cash used in operating activities	(8,679)	(44,186)
Cash flows from investing activities
Purchase of plant, property and equipment	(557)	(6,259)
Payment for intellectual property registration	(77)	(92)
Payment of guarantee deposits	(411)	(289)
Other	15	7
Net cash used in investing activities	(1,030)	(6,633)
Cash flows from financing activities
Proceeds from issuance of common stock		67
Net cash provided by financing activities		67
Effect of exchange rates on cash and cash equivalents	(1,330)	1,914
Net decrease in cash and cash equivalents	(11,039)	(48,838)
Cash and cash equivalents
Beginning of the period	102,434	153,606
End of the period	91,395	104,768
Supplemental cash flow information
Cash paid for interest	7,683	7,340
Cash paid (refunded) for income taxes	303	(21)
Non-cash investing activities
Property, plant and equipment additions in other accounts payable	$ 785	$ 1,271