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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015
Cash flows used in operating activities: |  |  |
Net loss | $ (23,525) |  | $ (45,477)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation | 418 |  | 902
Common stock contribution to 401(k) | 785 |  | 986
Stock-based compensation expense | 4,471 |  | 6,354
Revaluation of contingent warrant liabilities | (10,195) |  | 216
Amortization of debt issuance costs, debt discount and final payment fee on debt | 716 |  | 656
Loss on loan extinguishment |  |  | 429
Unrealized loss (gain) on foreign currency exchange | 249 |  | (1,571)
Other | 46 |  | 6
Changes in assets and liabilities: |  |  |
Trade and other receivables, net | 3,110 |  | 660
Prepaid expenses and other current assets | 881 |  | (258)
Accounts payable and accrued liabilities | (3,070) |  | (3,954)
Accrued interest on interest bearing obligations | 153 |  | 210
Deferred revenue | (2,181) |  | (342)
Other liabilities | (500) |  | 556
Net cash used in operating activities | (28,642) |  | (40,627)
Cash flows from investing activities: |  |  |
Proceeds from sale of property and equipment | 45 |  |
Purchase of property and equipment | (31) |  | (406)
Net cash provided by (used in) investing activities | 14 |  | (406)
Cash flows from financing activities: |  |  |
Proceeds from issuance of common stock, net of issuance costs | 45 |  | 211
Proceeds from exercise of warrants |  |  | 1
Proceeds from issuance of long term debt |  |  | 20,000
Debt issuance costs and loan fees |  |  | (512)
Principal payments ─ debt | (3,271) |  | (6,128)
Principal payments ─ capital lease | (57) |  |
Net cash (used in) provided by financing activities | (3,283) |  | 13,572
Effect of exchange rate changes on cash | (2) |  | (27)
Net decrease in cash and cash equivalents | (31,913) |  | (27,488)
Cash and cash equivalents at the beginning of the period | 65,767 | [1] | 78,445
Cash and cash equivalents at the end of the period | 33,854 |  | 50,957
Supplemental Cash Flow Information: |  |  |
Cash paid for interest | 1,127 |  | 792
Non-cash financing activities: |  |  |
Reclassification of contingent warrant liability to equity upon exercise of warrants |  |  | (3,088)
Interest added to principal balance on long-term debt | $ 194 |  | 159
Issuance of common stock warrants in connection with Hercules Term Loan |  |  | $ 450
[1] | The condensed consolidated balance sheet as of December 31, 2015 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, 2015.

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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 the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, 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=66902209&loc=d3e3291-108585 + 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=66902209&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=66902209&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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- Definition Defined contribution plan issuance of Common stock for services or claims. + References No definition available. + 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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