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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net loss | $ (62,638) | $ (10,657)
Adjustments to reconcile loss to net cash used in operating activities: |  |
Depreciation and amortization | 85 | 107
Excess tax provision on (benefit from) stock-based awards | 641 | (1)
Amortization of debt discount and debt issuance costs | 3,688 | 2,267
Amortization of intangible asset | 323 | 323
Loss (gain) on changes in fair value of derivative liabilities | 136 | (7,404)
Gain on extinguishment of debt |  | (38,034)
Deferred income taxes | (731) | 7
Changes in assets and liabilities: |  |
Restricted cash |  | 400
Accounts receivable | (2,101) | (2,719)
Inventories | (6,766) | 9,548
Prepaid and other current assets | 1,325 | (1,312)
Other non-current assets | 318 | 1,722
Accrued interest payable | 11 | 1,696
Deferred revenue | 14,625 | (1,703)
Accounts payable and other current liabilities | 6,976 | 2,779
Other non-current liabilities | 240 |
Net cash used in operating activities | (37,619) | (38,807)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Net cash used in investing activities | 0 | 0
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Proceeds from issuance of preferred stock, net of transaction costs | 52,149 |
Proceeds from exercise of stock options, net of transaction costs | 31 | 284
Proceeds from exercise of warrants, net of transaction costs | 2,713 |
Debt issuance costs |  | (2,425)
Excess tax (provision on) benefit from stock-based awards | (641) | 1
Acquisition of treasury stock | (117) |
Payments under capital leases | (5) | (39)
Net cash provided by (used in) financing activities | 54,130 | (2,179)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 16,511 | (40,986)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD | 119,539 | 191,514
CASH AND CASH EQUIVALENTS, END OF PERIOD | 136,050 | 150,528
Cash paid during the year for: |  |
Interest | 5,829 | 4,732
Income taxes | 171 | 414
Non-cash transactions: |  |
Transfer of preferred stock purchase option derivative liability to equity | 868 |
Conversion of Series A Convertible Preferred Stock into common stock | 4,804 |
Accretion of preferred stock beneficial conversion feature | 31,341 |
Reacquisition of conversion option in convertible notes |  | 10,100
Warrant |  |
Adjustments to reconcile loss to net cash used in operating activities: |  |
Stock-based compensation | (9) | (177)
Options and Restricted Stock Units |  |
Adjustments to reconcile loss to net cash used in operating activities: |  |
Stock-based compensation | $ 6,258 | $ 4,351

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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- Definition The cash outflow to reacquire common stock during 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 15 -Subparagraph (a) -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 cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + 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 (e) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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