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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Loss $ (15,220) $ (14,635)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 508 501
Stock-based compensation 2,990 2,811
Non-cash loss on disposal of assets 0 1
Non-cash investment income 0 (19)
Non-cash patent write-off 8 67
Right-of-use asset amortization 296 296
Changes in assets and liabilities:    
Accounts receivable (128) 116
Prepaid expenses and other current assets (71) 0
Other assets 0 1
Accounts payable 149 124
Accrued expenses (163) 41
Accrued salaries and payroll related expenses 62 (355)
Deferred revenue (655) (84)
Operating lease liabilities (299) (209)
Net cash used in operating activities (12,523) (11,344)
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases of property and equipment (407) (577)
Expenditures for patents and domain names (295) (195)
Redemption of investments held-to-maturity 0 24,831
Purchase of investments held-to-maturity 0 (12,432)
Net cash provided by (used in) investing activities (702) 11,627
CASH FLOWS FROM FINANCING ACTIVITIES    
Net proceeds from the sale of common stock from underwritten public offering 26,410 0
Proceeds from exercise of warrants 0 1,387
Net cash provided by financing activities 26,410 1,387
Effects of exchange rates on cash, cash equivalents and restricted cash 0 1
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 13,185 1,671
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — Beginning of period 10,838 4,605
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — End of period 24,023 6,276
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Taxes Paid 1 1
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES    
Restricted stock units issued in settlement of liability 342 314
Property and equipment included in accounts payable 24 17
Property and equipment included in accrued liabilities 0 57
Patents included in accounts payable 62 16
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents    
Total cash, cash equivalents and restricted cash $ 24,023 $ 6,276