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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net loss $ (26,396) $ (17,014)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 4,041 4,544
Provision for bad debts, net of recoveries 109 382
Provision for excess and obsolete inventory 3,033 1,823
Share-based compensation expense 1,239 1,889
Non-cash income tax benefit 0 (48)
Changes in assets and liabilities:    
Accounts receivable 14,241 2,689
Inventories (1,262) 8,296
Prepaid expenses and other assets 2,170 (608)
Accounts payable 2,487 4,322
Accrued expenses, income taxes, and other 1,375 226
Net cash provided by operating activities 1,037 6,501
Cash flows from investing activities:    
Purchases of property and equipment (1,241) (3,725)
Purchases of marketable securities (826) (9,661)
Marketable securities maturities / sales 9,945 14,516
Net cash provided by investing activities 7,878 1,130
Cash flows from financing activities:    
Proceeds from the issuance of short-term debt, net of issuance costs 0 10,000
Principal repayments of short-term debt (2,566) (8,444)
Taxes paid on vested restricted stock units, net of proceeds from stock option exercises (284) (261)
Net cash provided by (used in) financing activities (2,850) 1,295
Effect of exchange rates on cash and cash equivalents (51) (107)
Net increase in cash and cash equivalents 6,014 8,819
Cash and cash equivalents, beginning of period 2,911 16,044
Cash and cash equivalents, end of period 8,925 24,863
Cash paid during the year for:    
Interest 6 4
Income taxes $ 67 $ 60