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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 $ (26,533) $ (4,519)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization of property and equipment 125 107
Employee and non-employee stock-based compensation 1,393 1,298
Amortization of discounts and premiums on marketable securities 53 120
Intangible asset amortization 565 369
Changes in assets and liabilities:    
Accounts receivable 340 (294)
Prepaid expenses and other current assets (429) 679
Inventory (192)  
Accounts payable 292 826
Accrued liabilities 7,984 (1,313)
Other liabilities (50) 208
Deferred revenue (7,452) (6,606)
Net cash used in operating activities (23,904) (9,125)
Cash flows from investing activities    
Acquisition of intangible assets (8,000)  
Purchases of property and equipment (135) (23)
Purchases of marketable securities (2,319)  
Proceeds from sale of marketable securities 7,198  
Maturities of marketable securities 3,500 30,500
Change in restricted cash 145  
Net cash provided by investing activities 389 30,477
Cash flows from financing activities    
Tax obligations paid in connection with settlement of restricted stock units (436) (195)
Proceeds from exercise of employee stock options 2,447 2
Net cash provided by (used in) financing activities 2,011 (193)
Net (decrease) increase in cash and cash equivalents (21,504) 21,159
Cash and cash equivalents    
Beginning of period 64,764 88,772
End of period $ 43,260 $ 109,931