Stock-Based Compensation and Other Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2013

Black-Scholes Option Pricing Model to Estimate Fair Value of Stock Options Granted

We used the Black-Scholes option pricing model to estimate the fair value of stock options granted with the following assumptions:

	Year Ended			Nine Months Ended			Year Ended
	December 31,			December 31,			March 31,
	2013			2012			2012
Assumed forfeiture rate (annual %)		5.0	%		5.0	%		8.0	%
Expected dividend yield		0.0	%		0.0	%		0.0	%
Weighted average assumed stock price volatility		59.1	%		63.5	%		63.5	%
Weighted average risk-free rate		1.46	%		1.01	%		1.15	%
Weighted average expected life (years)		6.30			6.28			6.26

Options Activity Under Option Plan

Options activity under the Option Plan is summarized as follows:

	Stock Options Issued and Outstanding			Weighted Average Exercise Price
Balances, December 31, 2012		10,255,222		$	1.19
Options Granted		3,176,750			9.75
Options Exercised		(2,232,969	)		0.77
Options Forfeited/Expired		(370,321	)		1.90
Balances, December 31, 2013		10,828,682		$	3.76

Outstanding Options, Vested Options and Options Vested and Expected to Vest

A summary of outstanding options, vested options and options vested and expected to vest at December 31, 2013, is as follows:

	Stock Options Issued and Outstanding		Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price
Options Outstanding		10,828,682		8.07	$	3.76
Vested Options		3,875,734		6.93	$	0.96
Options Vested and Expected to Vest		10,362,887		8.03	$	3.63

Summary by Exercise Price of Outstanding Options, Vested Options, Options Vested and Expected to Vest

A summary by weighted average exercise price of outstanding options, vested options, and options vested and expected to vest at December 31, 2013, is as follows:

Exercise Price Range	Stock Options Outstanding		Weighted Average Remaining Contractual Life of Outstanding Stock Options (Years)	Number of Stock Options Vested		Number of Stock Options Vested and Expected to Vest
$0.01-$1.00		4,994,901	6.88		3,072,543		4,921,642
$1.01-$5.00		3,076,531	8.59		776,508		2,915,612
$5.01-$10.00		1,150,750	9.37		25,059		1,067,147
$10.01-$20.00		1,606,500	9.85		1,624		1,458,486
$0.01-$20.00		10,828,682	8.07		3,875,734		10,362,887