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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income (loss)	$ 2,616	$ (9,502)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Share-based compensation	861	793
Depreciation and amortization	30	35
Accretion on marketable securities	40	133
Changes in operating assets and liabilities:
Prepaid and other current assets	(920)	(110)
Other assets	308	181
Accounts payable, accrued liabilities and other liabilities	(2,673)	(1,735)
Net cash provided by (used in) operating activities	262	(10,205)
Cash flows from investing activities:
Purchase of marketable securities	(8,235)	(25,969)
Sale of marketable securities	11,104	36,721
Purchase of property and equipment	(14)	0
Net cash provided by investing activities	2,855	10,752
Cash flows from financing activities:
Tax withholding payments on net share settlement equity awards	(148)	(130)
Net proceeds from issuance of common stock	9,683	1,038
Net cash provided by financing activities	9,535	908
Net increase in cash and cash equivalents	12,652	1,455
Cash and cash equivalents at beginning of period	14,032	10,299
Cash and cash equivalents at end of period	$ 26,684	$ 11,754

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