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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Cash flows from operating activities: |  |
Net loss | $ (30,983) | $ (71,759)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation | 1,398 | 2,014
Common stock contribution to 401(k) | 870 | 828
Stock-based compensation expense | 9,885 | 3,946
Accrued interest on interest bearing obligations | (1,628) | 2,031
Revaluation of contingent warrant liabilities | (33,685) | 25,745
Amortization of debt discount, final payment fee on debt, and debt issuance costs | 2,041 | 1,841
Loss on sale costs and retirement of property and equipment | 0 | 281
Unrealized gain on foreign currency exchange | (1,541) | (55)
Unrealized loss on foreign exchange options | 326 | 184
Other non-cash adjustments | (5) | (21)
Changes in assets and liabilities: |  |
Trade and other receivables, net | 361 | 2,637
Prepaid expenses and other assets | (930) | (1,042)
Accounts payable and accrued liabilities | (4,392) | (2,130)
Deferred revenue | (2,534) | (1,436)
Other liabilities | (86) | (1,666)
Net cash used in operating activities | (60,903) | (38,602)
Cash flows from investing activities: |  |
Proceeds from maturities of investments | 15,000 | 40,000
Net purchase of property and equipment | (227) | (1,069)
Net cash provided by investing activities | 14,773 | 38,931
Cash flows from financing activities: |  |
Proceeds from issuance of common stock, net of issuance costs | 3,523 | 29,959
Proceeds from the exercise of warrants | 35 | 438
Principal payments of debt | (4,875) | (2,083)
Net cash (used in) provided by financing activities | (1,317) | 28,314
Effect of exchange rate changes on cash | (152) | 0
Net (decrease) increase in cash and cash equivalents | (47,599) | 28,643
Cash and cash equivalents at the beginning of the period | 101,659 | 45,345
Cash and cash equivalents at the end of the period | 54,060 | 73,988
Cash paid for: |  |
Interest | 2,848 | 988
Non-cash investing and financing activities: |  |
Reclassification of contingent warrant liability to equity upon exercise of warrants | (2,526) | (1,585)
Interest added to principal balances on long-term debt | 157 | 745
Investment in noncontrolling interest | $ 0 | $ 171

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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=31042434&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=31042434&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=31042434&loc=d3e3602-108585 + Details
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- 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 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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- Definition The increases (decreases) in the market value of warrants whose gains (losses) were included in earnings. + References No definition available. + Details
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