Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Cash Flows

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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
Operating activities    
Net loss $ (28,931) $ (38,686)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation and amortization 3,346 2,034
Stock-based compensation 17,392 6,524
Amortization of premium on investments 694 60
Amortization of debt issuance costs 49 66
Changes in assets and liabilities    
Accounts receivable 15,703 3,647
Prepaid expenses and other assets (5,212) (1,143)
Accounts payable and accrued liabilities 1,401 1,911
Accrued royalties 8,585 9,353
Accrued compensation (735) (4,065)
Deferred revenue (14,527) 7,422
Net cash used in operating activities (2,235) (12,877)
Investing activities    
Purchases of property and equipment (11,774) (4,318)
Purchases of investments (115,589) (13,365)
Proceeds from maturities of investments 34,010 18,830
Net cash provided by (used in) investing activities (93,353) 1,147
Financing activities    
Proceeds from employee stock purchase plan 863  
Proceeds from issuance of common stock 9,751 4,033
Net cash provided by financing activities 10,614 4,033
Effect of exchange rate changes on cash and cash equivalents 15 (6)
Net decrease in cash and cash equivalents (84,959) (7,703)
Cash and cash equivalents at beginning of period 245,755 59,939
Cash and cash equivalents at end of period $ 160,796 $ 52,236