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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014
Cash flows used in operating activities: |  |  |
Net loss | $ (45,958) |  | $ (30,983)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation | 1,319 |  | 1,398
Common stock contribution to 401(k) | 986 |  | 870
Stock-based compensation expense | 8,318 |  | 9,885
Revaluation of contingent warrant liabilities | (24,206) |  | (33,685)
Amortization of debt discount, final payment fee on debt, and debt issuance costs | 1,030 |  | 2,041
Loss on loan extinguishment | 429 |  |
Gain on sale and retirement of property and equipment | (18) |  |
Unrealized gain on foreign currency exchange | (1,344) |  | (1,541)
Unrealized loss on foreign exchange options | 5 |  | 326
Other non-cash adjustments |  |  | (5)
Changes in assets and liabilities: |  |  |
Trade and other receivables, net | (36,034) |  | 361
Prepaid expenses and other current assets | (1,019) |  | (930)
Accounts payable and accrued liabilities | (365) |  | (4,392)
Accrued interest on interest bearing obligations | 181 |  | (1,628)
Deferred revenue | 36,468 |  | (2,534)
Other liabilities | 549 |  | (86)
Net cash used in operating activities | (59,659) |  | (60,903)
Cash flows from investing activities: |  |  |
Proceeds from maturities of investments |  |  | 15,000
Net purchase of property and equipment | (466) |  | (227)
Proceeds from sale of property and equipment | 18 |  |
Net cash (used in) provided by investing activities | (448) |  | 14,773
Cash flows from financing activities: |  |  |
Proceeds from issuance of common stock, net of issuance costs | 360 |  | 3,523
Proceeds from exercise of warrants | 1 |  | 35
Proceeds from issuance of long term debt | 20,000 |  |
Debt issuance costs and loan fees | (512) |  |
Principal payments of debt | (6,128) |  | (4,875)
Net cash provided by (used in) financing activities | 13,721 |  | (1,317)
Effect of exchange rate changes on cash | (13) |  | (152)
Net decrease in cash and cash equivalents | (46,399) |  | (47,599)
Cash and cash equivalents at the beginning of the period | 78,445 | [1] | 101,659
Cash and cash equivalents at the end of the period | 32,046 |  | 54,060
Supplemental Cash Flow Information: |  |  |
Cash paid for interest | 1,452 |  | 2,848
Non-cash financing activities: |  |  |
Reclassification of contingent warrant liability to equity upon exercise of warrants | (3,552) |  | (2,526)
Interest added to principal balances on long-term debt | 159 |  | $ 157
Issuance of common stock warrants in connection with Hercules Term Loan | $ 450 |  |
[1] | The condensed consolidated balance sheet as of December 31, 2014 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.

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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow from maturities, prepayments, calls and collections of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References No definition available. + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition Unpaid interest added to the outstanding principal amount on long-term debt. + References No definition available. + Details
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- Definition Noncash value of warrants and rights issued. "Equity warrants and rights outstanding" represents derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. + References No definition available. + Details
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- Definition Noncash value related to the reclassification of a contingent warrant liability to equity upon exercise of warrants during the reporting period + References No definition available. + Details
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