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v3.8.0.1

Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Operating activities |  |
Net loss | $ (41,396) | $ (30,610)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation | 1,519 | 1,525
Amortization of premium on investments | 277 | 613
Unrealized loss (gain) on short-term investments | (165) | 1
Gain on disposal of property and equipment | 0 | (4)
Stock-based compensation | 10,878 | 8,409
Realized gain on sales of available-for-sale securities | 0 | (30)
Changes in operating assets and liabilities: |  |
Accounts receivable | (1,523) | 3,200
Prepaid expenses and other current assets | 1,380 | (2,943)
Other assets | (364) | (833)
Accounts payable | (1,960) | (3,273)
Accrued liabilities | (1,066) | (1,916)
Deferred revenue | (5) | (1,196)
Lease financing liability | 14 | 335
Other long-term liabilities | 448 | (413)
Net cash used in operating activities | (31,963) | (27,135)
Investing activities |  |
Purchases of property and equipment | (1,837) | (636)
Proceeds from sale of property and equipment | 0 | 5
Purchases of available-for-sale securities | (44) | (30)
Proceeds from sales of available-for-sale securities | 0 | 10,205
Proceeds from maturities of available-for-sale securities | 17,180 | 13,864
Net cash provided by investing activities | 15,299 | 23,408
Financing activities |  |
Repayments of lease liability | (101) | (101)
Cash paid for payroll taxes on restricted stock unit releases | (6,813) | (2,424)
Proceeds from issuance of common stock | 8,959 | 3,099
Net cash provided by financing activities | 2,045 | 574
Effect of exchange rate change on cash and cash equivalents | (32) | (31)
Net decrease in cash and cash equivalents | (14,651) | (3,184)
Total cash and cash equivalents at beginning of period | 673,658 | 173,782
Total cash and cash equivalents at end of period | $ 659,007 | $ 170,598

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26805-111562 + Details
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