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STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net loss | $ (19,375) | $ (11,168) | $ (8,735)
Adjustments to reconcile net loss to net cash used in operating activities: |  |  |
Depreciation expense | 338 | 145 | 41
Amortization of intangible assets | 242 | 242 | 242
Stock-based compensation | 1,630 | 922 | 1,815
Loss on sale of available-for-sale securities, including selling commissions | 309 | 0 | 0
Warrants issued to certain shareholders as inducement to exercise of warrants | 4,074 | 0 | 0
Contingently issuable warrant expense to investors | 0 | 0 | 65
Amortization of debt issuance costs and interest expense | 83 | 0 | 18
Changes in operating assets and liabilities: |  |  |
Amount due to BioTime and affiliates | (753) | 2,007 | 1,557
Prepaid expenses and other current assets | 115 | 101 | (274)
Accounts payable and accrued liabilities | (48) | 229 | 1,042
Net cash used in operating activities | (13,385) | (7,522) | (4,229)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |
Net proceeds from sale of available-for-sale securities | 934 | 0 | 815
Purchase of equipment | (91) | (106) | (500)
Security deposit | 0 | (75) | 0
Net cash provided by (used in) investing activities | 843 | (181) | 315
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from exercise of options | 610 | 218 | 4
Proceeds from exercise of warrants | 7,774 | 0 | 0
Proceeds from sale of common stock | 0 | 0 | 11,649
Proceeds from sale of common stock and warrants | 0 | 10,550 | 0
Financing costs related to sale of common stock and warrants | 0 | (773) | 0
Proceeds from issuance of loan payable, net of financing costs | 1,982 | 0 | 0
Repayment of loan payable | (133) | 0 | 0
Repayment of capital lease obligation | (265) | (114) | 0
Net cash provided by financing activities | 9,968 | 9,881 | 11,653
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | (2,574) | 2,178 | 7,739
CASH AND CASH EQUIVALENTS: |  |  |
At beginning of the year | 10,174 | 7,996 | 257
At end of the year | 7,600 | 10,174 | 7,996
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION |  |  |
Cash paid for interest | 130 | 29 | 0
SUPPLEMENTAL SCHEDULE OF NONCASH FINANCING AND INVESTING ACTIVITIES |  |  |
Equipment purchased under capital leases | 381 | 626 | 0
Debt issuance costs | 196 | 0 | 0
Common stock issued to BioTime for extinguishment of debt | 0 | 0 | 3,300
Common stock issued to BioTime upon conversion of convertible note payable and accrued interest | 0 | 0 | 3,318
Realized loss on sale of BioTime shares | $ 0 | $ 0 | $ 397

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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the sale of equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock warrants. + References No definition available. + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, 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=98514028&loc=d3e3291-108585 + Details
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