Statements of Financial Position Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Cash and Cash Equivalents, at Carrying Value	$ 35,365	$ 43,114
Marketable Securities, Current	123,045	113,871
Accounts Receivable, Net, Current	51,801	51,603
Inventory, Net	68,055	63,344
Deferred Tax Assets, Net, Current	8,986	8,986
Prepaid Expense and Other Assets	6,896	9,403
Assets, Current	294,148	290,321
Property, Plant and Equipment, Net	13,060	12,938
Goodwill	22,495	22,495
Intangible Assets, Net (Excluding Goodwill)	8,527	9,042
Other Assets, Noncurrent	31,605	31,841
Assets	369,835	366,637
Accounts Payable and Accrued Liabilities	22,174	17,747
Other Liabilities, Current	17,354	18,119
Liabilities, Current	39,528	35,866
Convertible senior notes	55,584	54,773
Other Liabilities, Noncurrent	9,191	8,670
Liabilities	104,303	99,309
Commitments and Contingencies
Common Stock, Value, Issued	32	32
Additional Paid in Capital, Common Stock	405,472	409,562
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,206)	(2,652)
Retained Earnings (Accumulated Deficit)	(137,766)	(139,614)
Stockholders' Equity Attributable to Parent	265,532	267,328
Liabilities and Equity	$ 369,835	$ 366,637