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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:    
Net loss $ (19,352) $ (16,168)
Adjustments to reconcile net loss to net cash used in operating activities:    
Equity-based compensation expense 1,295 2,453
Depreciation and amortization 65 225
Gain on disposal of assets 0 (1,429)
Amortization/accretion on marketable securities 232 282
Changes in operating assets and liabilities:    
Prepaid and other current assets 238 261
Other assets 504 291
Accounts payable, accrued liabilities and other liabilities (1,864) (5,901)
Net cash used in operating activities (18,882) (19,986)
Cash flows from investing activities:    
Purchase of marketable securities (32,938) (69,690)
Sales of marketable securities 54,370 62,567
Proceeds from CFC device sale 0 2,550
Acquisition of property and equipment 0 (134)
Net cash provided by (used in) investing activities 21,432 (4,707)
Cash flows from financing activities:    
Proceeds from exercise of options 0 355
Tax withholding payments on net share settlement equity awards (130) (403)
Net proceeds from issuance of capital stock 1,313 1,031
Repayment of notes payable 0 (159)
Net cash provided by financing activities 1,183 824
Net increase (decrease) in cash and cash equivalents 3,733 (23,869)
Cash and cash equivalents at beginning of year 10,299 34,168
Cash and cash equivalents at end of year 14,032 10,299
Supplemental Disclosure of Cash Flow Information:    
Interest 0 5
Taxes $ 0 $ 0