Stockholders' Equity (Tables)

6 Months Ended

Jul. 31, 2016

Stock activity excluding the ESPP is as follows:



			Options Outstanding
	Shares Available for Grant		Outstanding Stock Options		Weighted- Average Exercise Price		Aggregate Intrinsic Value (in thousands)
Balance as of January 31, 2016	46,879,908		26,258,798		$	56.26
Increase in shares authorized:
2013 Equity Incentive Plan	135,013
2014 Inducement Plan	1,013,581
Assumed equity plans	2,457,103
Options granted under all plans	(1,565,806	)	1,565,806		55.38
Restricted stock activity	(5,200,112	)
Stock grants to board and advisory board members	(98,689	)
Exercised	0		(3,117,908	)	38.70
Plan shares expired	(59,756	)
Canceled	436,380		(436,380	)	65.36
Balance as of July 31, 2016	43,997,622		24,270,316		$	58.30	$	570,515
Vested or expected to vest			22,438,870		$	57.32	$	549,383
Exercisable as of July 31, 2016			9,407,899		$	45.43	$	342,144

The following table summarizes information about stock options outstanding as of July 31, 2016:



	Options Outstanding				Options Exercisable
Range of Exercise Prices	Number Outstanding	Weighted- Average Remaining Contractual Life (Years)	Weighted- Average Exercise Price		Number of Shares	Weighted- Average Exercise Price
$0.86 to $39.09	5,009,819	2.1	$	31.52	4,222,980	$	32.46
$40.19 to $52.28	417,295	3.8	43.83		200,068	43.62
$52.30	3,558,218	4.3	52.30		2,177,833	52.30
$53.60 to $58.86	1,133,703	5.0	55.51		328,767	55.83
$59.34	5,922,503	5.3	59.34		2,227,005	59.34
$59.37 to $80.62	2,579,717	6.1	69.98		251,246	68.56
$80.99 to $82.55	5,649,061	6.3	81.02		0	0.00
	24,270,316	4.8	$	58.30	9,407,899	$	45.43

Restricted stock activity is as follows:



	Restricted Stock Outstanding
	Outstanding		Weighted- Average Exercise Price		Aggregate Intrinsic Value (in thousands)
Balance as of January 31, 2016	21,294,585		$	0.001
Granted- restricted stock units and awards	4,343,446		0.001
Canceled	(952,325	)	0.001
Vested and converted to shares	(3,528,045	)	0.001
Balance as of July 31, 2016	21,157,661		$	0.001	$	1,730,697
Expected to vest	18,103,499				$	1,480,866

The following number of shares of common stock were reserved and available for future issuance at July 31, 2016:



Options outstanding	24,270,316
Restricted stock awards and units and performance stock units outstanding	21,157,661
Stock available for future grant:
2013 Equity Incentive Plan	42,446,150
2014 Inducement Plan	1,465,329
Amended and Restated 2004 Employee Stock Purchase Plan	5,289,597
Acquired equity plans	86,143
Convertible Senior Notes	17,308,880
Warrants	17,308,880
	129,332,956