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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net loss $ (35,228) $ (22,107)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 5,889 6,774
Provision for bad debts, net of recoveries 187 1,005
Provision for excess and obsolete inventory 3,033 3,069
Share-based compensation expense 1,616 2,848
Change in fair value of warrant liability 4,788 0
Non-cash income tax benefit 0 266
Changes in assets and liabilities:    
Accounts receivable 11,600 (5,895)
Inventories (3,379) 8,922
Prepaid expenses and other assets 1,300 (2,169)
Accounts payable 5,500 2,832
Accrued expenses, income taxes, and other (4,790) 273
Net cash used in operating activities (9,484) (4,182)
Cash flows from investing activities:    
Purchases of property and equipment (1,513) (5,048)
Purchases of intangible assets (143) 0
Purchases of marketable securities (1,255) (22,238)
Marketable securities maturities / sales 18,513 31,731
Net cash provided by investing activities 15,602 4,445
Cash flows from financing activities:    
Proceeds from the issuances of Series C preferred and common stock, net of issuance costs 14,163 0
Proceeds from the issuance of short-term debt, net of issuance costs 0 13,400
Principal repayments of short-term debt (2,566) (10,969)
Taxes paid on vested restricted stock units net of proceeds from stock option exercises and ESPP (375) (515)
Net cash provided by financing activities 11,222 1,916
Effect of exchange rates on cash and cash equivalents (88) (85)
Net increase in cash and cash equivalents 17,252 2,094
Cash and cash equivalents, beginning of period 2,911 16,044
Cash and cash equivalents, end of period 20,163 18,138
Cash paid during the year for:    
Interest 80 31
Income taxes 83 59
Supplemental disclosures of non-cash investing activities:    
Building rent incentives to fund leasehold improvements 0 359
Supplemental disclosures of non-cash financing activities:    
Issuance of common stock for settlement of shareholder litigation 5,000 0
Initial fair value of warrant liability recorded upon issuance of Series C preferred and common stock 4,939 0
Change in fair value of warrant liability $ 4,788 $ 0