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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Loss $ (14,635) $ (11,668)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 501 390
Stock-based compensation 2,811 2,590
Non-cash loss on disposal of assets 1 0
Non-cash investment income (19) (37)
Non-cash patent write-off 67 48
Changes in assets and liabilities:    
Accounts receivable 116 (71)
Prepaid expenses and other current assets 0 54
Operating lease right-of-use assets 296  
Other assets 1 (50)
Deferred taxes 0 (1)
Accounts payable 124 62
Accrued expenses 41 (160)
Accrued salaries and payroll related expenses (355) (386)
Operating lease liabilities (209) 0
Deferred revenue (84) 96
Deferred rent 0 5
Net cash used in operating activities (11,344) (9,128)
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases of property and equipment (577) (552)
Expenditures for patents (195) (92)
Redemption of investments held-to-maturity 24,831 28,973
Purchase of investments held-to-maturity (12,432) (48,411)
Net cash provided by (used in) investing activities 11,627 (20,082)
CASH FLOWS FROM FINANCING ACTIVITIES    
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 1,387 21,464
Effects of exchange rates on cash, cash equivalents and restricted cash 1 4
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 1,671 (7,742)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — Beginning of period 4,605 19,624
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — End of period 6,276 11,882
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Taxes Paid 1 3
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES    
Restricted stock units issued in settlement of liability 314 727
Property and equipment included in accounts payable 17 22
Property and equipment included in accrued liabilities 57 0
Patents included in accounts payable 16 42
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents    
Total cash, cash equivalents and restricted cash $ 4,605 $ 19,624