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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Loss $ (22,082) $ (17,943)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 735 600
Benefit from income taxes 0 (41)
Stock-based compensation 4,200 3,958
Non-cash loss on disposal of assets 1 8
Non-cash investment income 0 (63)
Non-cash patent write-off 104 87
Right-of-use asset amortization 440  
Changes in assets and liabilities:    
Accounts receivable (1,841) (2)
Prepaid expenses and other current assets 102 206
Other assets 1 (50)
Accounts payable 280 88
Accrued expenses 101 (82)
Accrued salaries and payroll related expenses (433) (437)
Operating lease liabilities (346) 0
Deferred revenue 1,838 46
Deferred rent 0 47
Net cash used in operating activities (16,900) (13,578)
CASH FLOWS FROM INVESTING ACTIVITIES    
Proceeds from sale of fixed assets 0 16
Purchases of property and equipment (715) (865)
Expenditures for patents (306) (157)
Redemption of investments held-to-maturity 29,295 39,590
Purchase of investments held-to-maturity (12,432) (48,411)
Net cash provided by (used in) investing activities 15,842 (9,827)
CASH FLOWS FROM FINANCING ACTIVITIES    
Net proceeds from the sale of common stock from private placement offering 9,940 0
Net proceeds from the sale of common stock from underwritten public offering 0 21,190
Proceeds from exercise of stock options 0 14
Proceeds from exercise of warrants 1,387 260
Net cash provided by financing activities 11,327 21,464
Effects of exchange rates on cash, cash equivalents and restricted cash 0 (2)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 10,269 (1,943)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — Beginning of period 4,605 19,624
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — End of period 14,874 17,681
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Taxes Paid 1 3
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES    
Restricted stock units issued in settlement of liability 349 1,004
Property and equipment included in accounts payable 37 124
Property and equipment included in accrued liabilities 16 282
Patents included in accounts payable 70 32
Patents included in accrued liabilities 2 0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents    
Total cash, cash equivalents and restricted cash $ 4,605 $ 19,624