Condensed Statement of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities
Net loss	$ (4,256)	$ (1,277)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	393	373
Loss on disposal of property and equipment	20
Stock-based compensation	704	625
Non-cash interest expense	81	100
Compensation expense related to vesting of common stock to GLOBALFOUNDRIES		237
Changes in operating assets and liabilities:
Accounts receivable	1,540	(5,580)
Inventory	(562)	888
Prepaid expenses and other current assets	93	(617)
Other assets		(20)
Accounts payable	(955)	1,315
Accrued liabilities	(187)	257
Lease liabilities	(20)
Shipping term reversal		(39)
Net cash used in operating activities	(3,149)	(3,738)
Cash flows from investing activities
Purchases of property and equipment	(225)	(244)
Net cash used in investing activities	(225)	(244)
Cash flows from financing activities
Proceeds from the issuance of common stock, net of offering costs		24,609
Payments on debt	(1,500)
Payments on finance lease obligation	(3)	(3)
Proceeds from exercise of stock options and purchase of shares in employee stock purchase plan	13	309
Net cash (used in) provided by financing activities	(1,490)	24,915
Net (decrease) increase in cash and cash equivalents	(4,864)	20,933
Cash and cash equivalents at beginning of period	23,379	12,950
Cash and cash equivalents at end of period	18,515	33,883
Supplementary cash flow information:
Interest paid	135	111
Operating cash flows paid for operating leases	416
Financing cash flows paid for finance leases	3
Non-cash investing and financing activities:
Purchases of property and equipment in accounts payable	$ 20	$ 73