Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net loss	$ (1,449)	$ (4,077)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	12	8
Stock based compensation expense	253	2,964
Common stock issued for services	10
Loss on write-down of property and equipment		15
Changes in assets and liabilities:
Accounts receivable	614	(464)
Other current assets	(23)	(956)
Other non-current assets	18	18
Accounts payable	16	146
Accrued liabilities	(227)	390
Other non-current liabilities	(18)	(18)
Net cash used in operating activities	(794)	(1,974)
Cash flows from investing activities:
Purchase of property and equipment, net	(7)	(3)
Investment in marketable securities, net	(1,380)
Net cash used in investing activities	(1,387)	(3)
Cash flows from financing activities:
Proceeds from issuance of common stock		11,000
Principal repayments of debt		(2,149)
Advances on line of credit	1,600
Principal repayments on line of credit	(800)
Proceeds from exercise of stock options	7
Payments for deferred offering costs		(1,121)
Net cash provided by financing activities	807	7,730
Net change in cash and cash equivalents	(1,374)	5,753
Cash and cash equivalents at the beginning of the period	3,759	2,446
Cash and cash equivalents at the end of the period	2,385	8,199
Supplemental cash flow disclosures:
Cash paid for interest expense	$ 20	5
Non-cash transactions:
Deferred offering costs reclassified to equity		$ 76