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v3.8.0.1

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Cash flows from operating activities: |  |
Net loss | $ (10,142,000) | $ (17,570,000)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 573,000 | 780,000
Stock-based compensation | 552,000 | 1,794,000
Amortization of intangible assets | 84,000 | 83,000
Amortization of debt issuance costs | 33,000 | 23,000
Accrued interest | 656,000 | 440,000
(Gain)/loss on disposal of assets | (12,000) | 5,000
Changes in assets and liabilities: |  |
Accounts receivable | (1,160,000) | 103,000
Inventories | 205,000 | 173,000
Prepaid expenses and other assets | (1,289,000) | 343,000
Accounts payable | (390,000) | (759,000)
Deferred revenue and other liabilities | 1,931,000 | (383,000)
Net cash used in operating activities | (8,959,000) | (14,968,000)
Cash flows from investing activities: |  |
Purchases of property and equipment | (26,000) | (646,000)
Proceeds from sales and maturities of marketable securities | 2,604,000 | 40,612,000
Purchases of marketable securities | (1,602,000) | (28,749,000)
Net cash provided by investing activities | 988,000 | 11,217,000
Net proceeds from sale of assets | 12,000 |
Cash flows from financing activities: |  |
Net proceeds from issuance of common stock | 1,989,000 | 363,000
Proceeds from the issuance of notes payable, net of issuance costs |  | 7,879,000
Payments on capital lease obligations |  | (123,000)
Net cash provided by (used in) financing activities | 1,989,000 | 8,119,000
Net increase (decrease) in cash and cash equivalents | (5,982,000) | 4,368,000
Cash and cash equivalents at beginning of period | 8,766,000 | 5,640,000
Cash and cash equivalents at end of period | 2,784,000 | 10,008,000
Supplemental disclosure: |  |
Issuance of convertible notes in settlement of accrued interest | $ 854,000 | $ 336,000

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- Definition Amount of amortization expense attributable to debt discount (premium) and debt issuance costs. + References Reference 1: 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=66902209&loc=d3e3602-108585 + Details
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