Condensed Statement of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net loss	$ (6,086)	$ (4,540)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	232	196
Loss on disposal of property and equipment		80
Stock-based compensation	431	111
Change in fair value of redeemable convertible preferred stock warrant liability		46
Change in fair value of derivative liability		8
Non-cash interest expense	59	266
Compensation expense related to vesting of common stock to GLOBALFOUNDRIES	255	520
Changes in operating assets and liabilities:
Accounts receivable	513	392
Amounts due from related parties	(37)	(729)
Inventory	(755)	27
Prepaid expenses and other current assets	211	(468)
Other assets	(11)	4
Accounts payable	695	(871)
Accrued liabilities	93	959
Amounts due to related parties	717	1,428
Deferred income on shipments to distributors	(357)	160
Deferred revenue		(229)
Net cash used in operating activities	(4,040)	(2,640)
Cash flows from investing activities
Purchases of property and equipment	(470)	(67)
Net cash used in investing activities	(470)	(67)
Cash flows from financing activities
Proceeds from convertible promissory notes-related party		5,000
Proceeds from debt		1,500
Payments on debt	(727)
Payments of debt issuance costs		(15)
Payments on capital lease obligation	(7)	(55)
Proceeds from exercise of stock options	9	9
Net cash (used in) provided by financing activities	(725)	6,439
Net (decrease) increase in cash and cash equivalents	(5,235)	3,732
Cash and cash equivalents at beginning of period	29,727	2,307
Cash and cash equivalents at end of period	24,492	6,039
Supplementary cash flow information:
Interest paid	171	$ 35
Non-cash investing and financing activities:
Purchase of property and equipment in accounts payable	$ 965