Statements of Financial Position Consolidated Balance Sheet - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents, at Carrying Value	$ 38,186	$ 44,554
Marketable Securities, Current	110,055	116,924
Accounts Receivable, Net, Current	64,747	55,492
Inventory, Net	74,143	71,490
Prepaid Expense and Other Assets	21,519	8,137
Assets, Current	308,650	296,597
Property, Plant and Equipment, Net	13,950	12,346
Goodwill	22,495	22,495
Intangible Assets, Net (Excluding Goodwill)	11,998	12,593
Other Assets, Noncurrent	35,616	35,532
Assets	392,709	379,563
Liabilities, Current [Abstract]
Accounts Payable and Accrued Liabilities	20,029	21,466
Taxes Payable, Current	5,697	1,163
Deferred Revenue, Current	6,713	6,441
Convertible Debt, Current	58,863	57,846
Other Liabilities, Current	10,627	12,415
Liabilities, Current	101,929	99,331
Convertible senior notes		57,846
Other Liabilities, Noncurrent	10,269	9,554
Liabilities	$ 112,198	$ 108,885
Commitments and Contingencies
Stockholders' Equity Attributable to Parent [Abstract]
Common Stock, Value, Issued	$ 31	$ 31
Additional Paid in Capital, Common Stock	390,190	394,928
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,991)	(2,623)
Retained Earnings (Accumulated Deficit)	(107,719)	(121,658)
Stockholders' Equity Attributable to Parent	280,511	270,678
Liabilities and Equity	$ 392,709	$ 379,563

Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.