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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES    
Net Loss $ (11,668) $ (9,157)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 390 382
Deferred tax benefit (20) (24)
Stock-based compensation 2,590 1,358
Non-cash investment income (37) 0
Non-cash patent write-off 48 0
Changes in assets and liabilities:    
Accounts receivable (71) (106)
Prepaids and other current assets 54 (39)
Other assets (50) (3)
Accounts payable 62 (248)
Accrued expenses (141) 70
Accrued salaries and payroll related expenses (386) 160
Deferred revenue 96 (84)
Deferred rent 5 (12)
Net cash used in operating activities (9,128) (7,703)
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases of property and equipment (552) (369)
Expenditures for patents and domain names (92) (193)
Redemption of investments held-to-maturity 28,973 4,747
Purchase of investments held-to-maturity (48,411) 0
Net cash provided by (used in) investing activities (20,082) 4,185
CASH FLOWS FROM FINANCING ACTIVITIES    
Net proceeds from the sale of common stock from private placement offering 0 7,468
Net proceeds from the sale of common stock from underwritten public offering 21,190 0
Proceeds from exercise of stock options 14 54
Proceeds from exercise of warrants 260 0
Net cash provided by financing activities 21,464 7,522
Effects of exchange rates on cash, cash equivalents and restricted cash 4 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (7,742) 4,004
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — Beginning of period 19,624 5,184
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — End of period 11,882 9,188
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION    
Taxes Paid 3 1
SUPPLEMENTAL DISCLOSURE OF NON-CASH ACTIVITIES    
Issuance of common stock in settlement of liability 727 272
Stock options issued in settlement of liability 0 332
Property and equipment included in accounts payable 22 30
Patents included in accounts payable 42 23
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]    
Total cash, cash equivalents and restricted cash $ 19,624 $ 5,184