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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net loss	$ (8,141)	$ (19,352)
Adjustments to reconcile net loss to net cash used in operating activities:
Equity-based compensation expense	1,265	1,295
Depreciation and amortization	63	65
Amortization/accretion on marketable securities	307	232
Changes in operating assets and liabilities:
Prepaid and other current assets	56	238
Other assets	466	504
Accounts payable, accrued liabilities and other liabilities	(2,839)	(1,864)
Net cash used in operating activities	(8,823)	(18,882)
Cash flows from investing activities:
Purchase of marketable securities	(34,799)	(32,938)
Sales of marketable securities	27,542	54,370
Purchases of property and equipment	(20)	0
Net cash (used in) provided by investing activities	(7,277)	21,432
Cash flows from financing activities:
Tax withholding payments on net share settlement equity awards	(148)	(130)
Net proceeds from issuance of capital stock	18,728	1,313
Net cash provided by financing activities	18,580	1,183
Net increase in cash and cash equivalents	2,480	3,733
Cash and cash equivalents at beginning of year	14,032	10,299
Cash and cash equivalents at end of year	16,512	14,032
Supplemental Disclosure of Cash Flow Information:
Interest	0	0
Taxes	$ 0	$ 0

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