Stock-Based Compensation -Stock Option Transactions for Common Stock (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Jan. 30, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding
Beginning balance, Outstanding (in shares) | shares	2,247
Granted (in shares) | shares	1,510
Exercised (in shares) | shares	0
Cancelled (in shares) | shares	(1,203)
Ending balance, Outstanding (in shares) | shares	2,554
Options vested and expected to vest (in shares) | shares	2,554
Exercisable (in shares) | shares	1,193
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Beginning balance, Outstanding (usd per share) | $ / shares	$ 4.62
Granted, Weighted Average Exercise Price (usd per share) | $ / shares	3.16
Exercised, Weighted Average Exercise Price (usd per share) | $ / shares	0.00
Cancelled, Weighted Average Exercise Price (usd per share) | $ / shares	5.51
Ending balance, Outstanding (usd per share) | $ / shares	3.34
Options vested and expected to vest, Weighted Average Exercise Price (usd per share) | $ / shares	3.34
Exercisable, Weighted Average Exercise Price (usd per share) | $ / shares	$ 3.48
Outstanding, Weighted-Average Remaining Contractual Term	5 years 9 months 22 days
Options vested and expected to vest, Weighted-Average Remaining Contractual Term	5 years 9 months 22 days
Exercisable, Weighted-Average Remaining Contractual Term	5 years 8 months 27 days
Outstanding, Aggregate Intrinsic Value | $	$ 0.0
Options vested and expected to vest, Aggregate Intrinsic Value | $	0.0
Exercisable, Aggregate Intrinsic Value | $	$ 0.0