Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Net revenue	$ 65,905	$ 134,407	$ 125,751
Cost of revenue	41,446	78,936	71,228
Gross profit	24,459	55,471	54,523
Operating expenses
Research and development	52,656	57,277	53,943
Sales and marketing	9,086	7,573	7,457
General and administrative	20,387	16,568	18,620
Restructuring costs	9,327		9
Impairment of IP, mask sets, design tools and goodwill	50,351	1,148	418
Total operating expenses	141,807	82,566	80,477
Loss from operations	(117,348)	(27,095)	(25,924)
Gain on sale of development project			7,551
Impairment of privately-held investments, net of gain on sale	200	(885)	136
Interest and other income, net	(2,470)	283	1,516
Loss before income taxes	(119,818)	(27,697)	(16,698)
(Benefit from) provision for income taxes	714	(5,750)	(4,385)
Net loss from continuing operations	(119,104)	(33,447)	(21,083)
Income from discontinued operations	4,655	16,029	24,047
Provision for income taxes	5,592	897	2,806
Net (loss) income from discontinued operations	(937)	15,132	21,241
Net (loss) income	$ (120,041)	$ (18,315)	$ 158
Net (loss) income per common share:
Net loss per share from continuing operations - basic (in dollars per share)	$ (3.09)	$ (0.89)	$ (0.59)
Net loss per share from continuing operations - diluted (in dollars per share)	(3.09)	(0.89)	(0.58)
Net (loss) income per share from discontinued operations - basic (in dollars per share)	(0.03)	0.40	0.59
Net (loss) income per share from discontinued operations - diluted (in dollars per share)	(0.03)	0.40	0.58
Net (loss) income per share - basic (in dollars per share)	(3.12)	(0.49)	0
Net (loss) income per share - diluted (in dollars per share)	$ (3.12)	$ (0.49)	$ 0
Shares used in computing net (loss) income per share:
Basic (in shares)	38,527	37,429	35,890
Diluted (in shares)	38,527	37,429	36,669