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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |
Net loss | $ (11,409) | $ (10,668) | $ (32,048)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Depreciation and amortization | 598 | 747 | 998
Stock-based compensation | 674 | 719 | 2,155
Amortization of intangible assets | 111 | 112 | 111
Impairment of goodwill | 12,856 |  | 9,858
Amortization of debt issuance costs | 30 | 45 | 37
Accrued interest | 551 | 898 | 650
(Gain) loss on disposal of assets |  | (12) | 4
Changes in assets and liabilities |  |  |
Accounts receivable | 289 | (1,122) | 170
Inventories | 618 | (315) | 146
Prepaid expenses and other assets | 440 | (1,016) | 459
Accounts payable | 66 | (402) | (419)
Deferred revenue and other liabilities | (4,489) | 3,435 | (64)
Net cash provided by (used in) operating activities | 335 | (7,579) | (17,943)
Cash flows from investing activities: |  |  |
Purchases of property and equipment | (50) | (300) | (646)
Net proceeds from sale of assets |  | 12 |
Proceeds from sales and maturities of marketable securities |  | 2,604 | 50,486
Purchases of marketable securities |  | (1,602) | (36,874)
Net cash provided by (used in) investing activities | (50) | 714 | 12,966
Cash flows from financing activities: |  |  |
Proceeds from sale of common stock and warrants, net of issuance costs | 10,362 | 1,967 | 364
Taxes paid to net share settle equity awards | (46) |  |
Proceeds from the issuance of notes payable, net of issuance costs |  |  | 7,877
Payments on long term debt | (7,365) |  |
Payments on capital lease obligations |  |  | (138)
Net cash provided by financing activities | 2,951 | 1,967 | 8,103
Net increase (decrease) in cash and cash equivalents | 3,236 | (4,898) | 3,126
Cash and cash equivalents at beginning of year | 3,868 | 8,766 | 5,640
Cash and cash equivalents at end of year | 7,104 | 3,868 | 8,766
Supplemental disclosure: |  |  |
Issuance of convertible notes in settlement of accrued interest | 846 | 854 | 336
Cash paid for income taxes | $ 15 | $ 2 | $ 21

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration