Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities
Net loss	$ (15,644)	$ (12,956)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	190	184
Stock-based compensation	1,280	1,090
Changes in operating assets and liabilities:
Prepaid expenses, deposits and other	(279)	1,101
Accounts payable and accrued expenses	1,664	1,210
Net cash used in operating activities	(12,103)	(5,515)
Investing activities
Purchases of equipment	(347)	(64)
Net cash used in investing activities	(347)	(64)
Financing activities
Proceeds from issuance of common stock	10,250	5,607
Shares retained for withholding tax payments on stock-based awards	(149)	(69)
Net cash provided by financing activities	10,101	5,538
Decrease in cash and cash equivalents	(2,349)	(41)
Cash and cash equivalents at beginning of the period	35,041	51,059
Cash and cash equivalents at end of the period	32,692	51,018
Consolidated entity excluding, related party
Changes in operating assets and liabilities:
Accounts receivable	0	251
Healios
Changes in operating assets and liabilities:
Accounts receivable	686	2,261
Deferred revenue - Healios	0	499
Advances and deposits from Healios	$ 0	$ 845