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
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Operating activities    
Net loss $ (64,322) $ (40,659)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities    
Depreciation and amortization 9,365 7,109
Stock-based compensation 50,679 38,005
Amortization of premium on investments, net 1,229 1,380
Other operating activities 944 446
Changes in operating assets and liabilities    
Accounts receivable (16,123) (13,542)
Prepaid expenses and other assets (2,104) (3,253)
Accounts payable and accrued liabilities 10,363 1,095
Accrued royalties 7,697 6,145
Accrued compensation 5,897 10,748
Deferred revenue 12,685 (19,887)
Reimbursement of cost of leasehold improvements 749 3,161
Net cash provided by (used in) operating activities 17,059 (9,252)
Investing activities    
Purchases of property and equipment (17,947) (16,424)
Purchases of investments (111,541) (194,122)
Proceeds from maturities of investments 132,119 116,831
Proceeds from sale of investments 3,662 0
Payments related to acquisition (200) 0
Net cash provided by (used in) investing activities 6,093 (93,715)
Financing activities    
Proceeds from employee stock purchase plan 3,275 2,482
Proceeds from exercise of stock options 2,862 12,562
Tax payments from net share settlements of restricted stock units (907) 0
Net cash provided by financing activities 5,230 15,044
Effect of exchange rate changes on cash and cash equivalents (236) 16
Net increase (decrease) in cash and cash equivalents 28,146 (87,907)
Cash and cash equivalents at beginning of period 175,957 245,755
Cash and cash equivalents at end of period 204,103 157,848
Supplemental disclosures of cash flow information    
Cash paid during the period for interest 219 246
Purchases of property and equipment recorded in accounts payable and accrued liabilities $ 3,637 $ 3,337