Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2016

Equity [Abstract]

Summary of Allocated Stock-based Compensation Expense

The Company’s stock-based compensation expense is allocated between research and development and selling, general and administrative as follows:

	Three months ended,				Nine months ended,
	September 30,		September 30,		September 30,		September 30,
Stock-based compensation expense	2016		2015		2016		2015
Research and Development	$	0.5	$	1.1	$	2.1	$	3.1
Selling, General and Administrative	$	3.6	$	3.9	$	9.5	$	9.6

Weighted Average for Key Assumptions Used in Determining Fair Value of Options Granted

The weighted average for key assumptions used in determining the fair value of options granted during the nine months ended September 30, 2016 follows:

Expected price volatility	62.36% - 82.38%
Risk-free interest rate	0.56% - 1.70%
Weighted average expected life in years	6 years
Dividend yield	—

Summary of Stock Option Activity

Option activity during the nine months ended September 30, 2016 was as follows:

	Number of Shares			Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value
Outstanding at January 1, 2016		3,397,529		$	5.42
Granted in 2016
Officers and Directors		95,000			2.34
Others		386,303			3.49
Exercised		(147,425	)		2.01
Forfeitures		(394,898	)		9.06
Outstanding at September 30, 2016		3,336,509		$	4.83	$	459

Summary of Restricted Stock Activity

Restricted stock activity during the nine months ended September 30, 2016 was as follows:

	Number of Restricted Shares			Weighted Average Fair Market Value Per RSU
Outstanding at January 1, 2016		4,298,154		$	10.23
Granted:
Executive officers		913,000			3.80
Directors		185,000			2.43
Employees		308,000			2.32
Vested		(592,066	)		2.68
Forfeitures		(640,291	)		11.47
Outstanding at September 30, 2016		4,471,797		$	9.28