Condensed Statement of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net loss	$ (1,277)	$ (6,086)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	373	232
Stock-based compensation	625	431
Non-cash interest expense	100	59
Compensation expense related to vesting of common stock to GLOBALFOUNDRIES	237	255
Changes in operating assets and liabilities:
Accounts receivable	(5,810)	513
Amounts due from related parties	230	(37)
Inventory	888	(755)
Prepaid expenses and other current assets	(617)	211
Other assets	(20)	(11)
Accounts payable	(353)	695
Accrued liabilities	(127)	93
Amounts due to related parties	2,052	717
Deferred income on shipments to distributors	(39)	(357)
Net cash used in operating activities	(3,738)	(4,040)
Cash flows from investing activities
Purchases of property and equipment	(244)	(470)
Net cash used in investing activities	(244)	(470)
Cash flows from financing activities
Proceeds from issuance of common stock, net of offering costs	24,609
Payments on debt		(727)
Payments on capital lease obligation	(3)	(7)
Proceeds from exercise of stock options and purchase of shares in employee stock purchase plan	309	9
Net cash provided by (used in) financing activities	24,915	(725)
Net increase (decrease) in cash and cash equivalents	20,933	(5,235)
Cash and cash equivalents at beginning of period	12,950	29,727
Cash and cash equivalents at end of period	33,883	24,492
Supplementary cash flow information:
Interest paid	111	171
Non-cash investing and financing activities:
Purchase of property and equipment in accounts payable and amounts due to related parties	$ 73	$ 965