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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net loss $ (8,981) $ (9,122)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 2,125 2,310
Provision for bad debts 30 156
Inventory provision 180 65
Share-based compensation expense 477 949
Non-cash income tax benefit (6) (120)
Changes in assets and liabilities:    
Accounts receivable 9,928 (1,026)
Inventories 2,484 8,761
Prepaid expenses and other assets 2,418 55
Accounts payable (1,175) (644)
Accrued expenses, income taxes, and other (2,085) 499
Net cash provided by operating activities 5,395 1,883
Cash flows from investing activities:    
Purchases of property and equipment (513) (2,852)
Purchases of marketable securities 0 (3,754)
Marketable securities maturities / sales 6,564 3,159
Net cash provided by (used in) investing activities 6,051 (3,447)
Cash flows from financing activities:    
Proceeds from the issuance of short-term debt, net of issuance costs 0 7,000
Principal repayments of short-term debt (2,268) (2,178)
Restricted cash relating to short-term debt 0 (661)
Proceeds from stock option exercises and ESPP net of taxes paid on vested restricted stock units (217) (304)
Net cash provided by (used in) financing activities (2,485) 3,857
Effect of exchange rates on cash and cash equivalents (45) (65)
Net increase in cash and cash equivalents 8,916 2,228
Cash and cash equivalents, beginning of period 2,911 16,044
Cash and cash equivalents, end of period 11,827 18,272
Cash paid during the year for:    
Interest 6 0
Income taxes $ 64 $ 26