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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities    
Net loss $ (10,665) $ (14,780)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation and amortization 2,904 2,844
Non-cash interest expense 2,908 2,452
Stock-based compensation expense 2,995 2,609
Provision for bad debts 1,327 899
Changes in operating assets and liabilities:    
Accounts receivable 857 (3,906)
Inventories 5,668 (2,865)
Deferred revenue (3,784) 49
Prepaid expenses and other assets (1,903) (729)
Accounts payable, accrued expenses, and other liabilities (1,826) 4,536
Other long-term liabilities 319 (12)
Net cash used in operating activities (1,200) (8,903)
Cash flows from investing activities    
Purchases of property and equipment (1,069) (1,699)
Net cash used in investing activities (1,069) (1,699)
Cash flows from financing activities    
Net proceeds from issuance of common stock 94,361 633
Payment of withholding taxes in connection with vesting of restricted stock units (1,320) (980)
Net cash provided by (used in) financing activities 93,041 (347)
Net increase (decrease) in cash and cash equivalents 90,772 (10,949)
Cash and cash equivalents, beginning of period 57,293 93,955
Cash and cash equivalents, end of period $ 148,065 $ 83,006