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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from operating activities: |  |  |
Net loss | $ (70,889) | $ (32,743) | $ (68,756)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation | 4,124 | 5,357 | 5,721
Common stock contribution to 401(k) | 1,134 | 1,046 | 905
Stock-based compensation expense | 4,284 | 7,759 | 4,913
Accrued interest on interest bearing obligations | 1,186 | 1,023 | 353
Revaluation of contingent warrant liabilities | 9,172 | (3,866) | (2,283)
Restructuring charge related to long-lived assets | 2,460 | 0 | 0
Amortization of debt discount, final payment fee on debt, and debt issuance costs | 1,958 | 1,360 | 0
Unrealized loss on foreign currency exchange | 295 | 513 | 0
Unrealized loss on foreign exchange options | 714 | 298 | 0
Warrant modification expense | 0 | 0 | 4,500
Other non-cash adjustments | 18 | 107 | 19
Changes in assets and liabilities: |  |  |
Trade and other receivables, net | 4,064 | 8,532 | (13,633)
Prepaid expenses and other assets | (158) | (2,469) | 199
Accounts payable and accrued liabilities | 4,309 | (2,144) | 2,650
Deferred revenue | (3,511) | (13,794) | 13,122
Other liabilities | 75 | (41) | (247)
Net cash used in operating activities | (40,765) | (29,062) | (52,537)
Cash flows from investing activities: |  |  |
Purchases of investments | (56,970) | 0 | 0
Proceeds from maturities of investments | 17,000 | 0 | 0
Purchase of property and equipment | (2,509) | (3,304) | (339)
Proceeds from Sale of property and equipment | 463 | 0 | 0
Net used in investing activities | (42,016) | (3,304) | (339)
Cash flows from financing activities: |  |  |
Proceeds from issuance of common stock, net of issuance costs | 77,491 | 15,143 | 70,771
Proceeds from issuance of long-term debt, net of issuance costs | 4,434 | 28,836 | 0
Principal payments of debt | (2,143) | 0 | 0
Payment for modification of warrants | 0 | 0 | (4,500)
Net cash provided financing activities | 79,782 | 43,979 | 66,271
Effect of exchange rate changes on cash | 0 | (573) | 0
Net increase in cash and cash equivalents | (2,999) | 11,040 | 13,395
Cash and cash equivalents at the beginning of the period | 48,344 | 37,304 | 23,909
Cash and cash equivalents at the end of the period | 45,345 | 48,344 | 37,304
Cash paid during the year for: |  |  |
Interest | 1,035 | 7 | 0
Income taxes | 0 | 15 | 16
Non-cash investing and financing activities: |  |  |
Discount on long-term debt | (55) | (9,114) | 0
Issuance of contingent warrant liabilities, net of extinguishments | 5,450 | 0 | 1,767
Interest added to principal balances on long-term debt | $ 1,160 | $ 669 | $ 353

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