Cash Flow

v3.10.0.1
Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net Cash Provided by (Used in) Operating Activities [Abstract]      
Net loss $ (40,254) $ (26,580) $ (13,557)
Reconciliation of net loss to net cash used in operating activities      
Depreciation 3,213 2,908 687
Amortization of intellectual property 190 163 128
Accretion of asset retirement obligation 44 31 0
Fair value of warrant modification, net 402 0 0
Fair value of warrants issued for consulting services 0 0 138
Fair value of common stock issued for consulting services 423 0 0
Stock-based compensation 1,201 1,081 1,060
Amortization of debt discount 2,006 360 54
Amortization of deferred financing costs 83 83 62
Non-cash convertible note interest expense 690 618 343
Lease liability, net of deferred rent write-off (493) 0 0
Amortization of lease liability (80) 0 0
Impairment of acquired intellectual property 0 2,411 0
Loss on sale of equipment 869 76 0
Inventory write down 179 456 0
Changes in operating assets and liabilities      
Accounts receivable 157 (882) 0
Inventory 295 (1,636) (59)
Prepaid expenses and other current assets 400 236 (394)
Accounts payable 472 926 (176)
Accrued expenses 4,009 924 564
Deferred rent (124) (177) 29
Net cash used in operating activities (26,318) (19,002) (11,121)
Cash flows from investing activities:      
Purchases of property and equipment (3,693) (8,819) (29,156)
Proceeds from sale of equipment 0 4 0
Other assets (236) (345) (250)
Intellectual property related expenditures 0 (615) (200)
Net cash used in investing activities (3,929) (9,775) (29,606)
Cash flows from financing activities:      
Proceeds from issuance of common stock, net of transaction costs 28,753 25,325 30,709
Payments on notes payable (277) (201) (14)
Payments on capital leases (130) (136) (52)
Proceeds from issuance of convertible notes payable, net of issuance costs 0 0 4,858
Net cash provided by financing activities 28,346 24,988 35,501
Net decrease in cash, cash equivalents and restricted cash (1,901) (3,789) (5,226)
Cash, cash equivalents and restricted cash at beginning of period 22,793 26,582 31,808
Cash, cash equivalents and restricted cash at end of period 20,892 22,793 26,582
Supplemental disclosure of cash flow information:      
Cash paid for interest, net of amounts capitalized 668 699 330
Cash paid for income taxes 2 2 1
Non-cash investing activities      
Tenant improvement allowances 0 0 78
Non-cash financing activities      
Capital lease 38 0 310
Fair value of consulting warrants 0 0 138
Fair value of financing warrants 0 0 229
Fair value of common stock issued to consultants 423 0 0
Total non-cash financing activities 461 0 677
Supplemental disclosure of non-cash transactions      
Change in property and equipment resulting from change in accounts payable 180 (1,062) 1,200
Change in property and equipment resulting from change in accrued expenses (14) (1,098) 1,330
Recognition of convertible debt discount 0 0 4,975
Asset retirement obligation offset with asset retirement cost (property and equipment) 0 670 0
Fair value of common stock issued for intellectual property 0 2,149 0
Reduction in accrued liabilities upon modification of Interstate Battery warrant 1 $ 600 $ 0 $ 0

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