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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Cash flows used in operating activities: |  |  |
Net loss | $ (10,429) |  | $ (23,525)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation | 231 |  | 418
Common stock contribution to 401(k) | 506 |  | 785
Stock-based compensation expense | 2,855 |  | 4,471
Revaluation of contingent warrant liabilities |  |  | (10,195)
Amortization of debt issuance costs, debt discount and final payment fee on debt | 405 |  | 716
Loss on extinguishment of debt | 515 |  |
Gain on sale and disposal of equipment | (1,226) |  |
Unrealized loss on foreign currency exchange | 1,199 |  | 249
Other | 57 |  | 46
Changes in assets and liabilities: |  |  |
Trade and other receivables, net | (10,065) |  | 3,110
Prepaid expenses and other current assets | 275 |  | 881
Accounts payable and accrued liabilities | (4,387) |  | (2,629)
Accrued restructuring costs | (2,574) |  | (441)
Accrued interest on interest bearing obligations | 102 |  | 153
Deferred revenue | (219) |  | (2,181)
Other liabilities |  |  | (500)
Net cash used in operating activities | (22,755) |  | (28,642)
Cash flows from investing activities: |  |  |
Proceeds from sale of equipment | 1,614 |  | 45
Purchase of property and equipment |  |  | (31)
Net cash provided by investing activities | 1,614 |  | 14
Cash flows from financing activities: |  |  |
Proceeds from issuance of common and preferred stock, net of issuance costs | 25,472 |  | 45
Principal payments ─ debt | (16,380) |  | (3,271)
Payment of final fee related to loan extinguishment | (1,150) |  |
Principal payments ─ capital lease | (51) |  | (57)
Net cash provided by (used in) financing activities | 7,891 |  | (3,283)
Effect of exchange rate changes on cash | (27) |  | (2)
Net decrease in cash and cash equivalents | (13,277) |  | (31,913)
Cash and cash equivalents at the beginning of the period | 25,742 | [1] | 65,767
Cash and cash equivalents at the end of the period | 12,465 |  | 33,854
Supplemental cash flow information: |  |  |
Cash paid for interest | 396 |  | 1,127
Non-cash investing and financing activities: |  |  |
Interest added to principal balance on long-term debt | $ 236 |  | $ 194
[1] | The condensed consolidated balance sheet as of December 31, 2016 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, 2016.

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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=98514028&loc=d3e3602-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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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Data Type: | xbrli:monetaryItemType
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- Definition The cash outflow for end-of-term fee paid to the lender. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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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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