Stockholders' Equity (Tables)

6 Months Ended

Jun. 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,		Six months ended,
Stock-based compensation expense	June 30, 2016	June 30, 2015	June 30, 2016	June 30, 2015
Research and Development	$0.5	$1.1	$1.6	$1.9
Selling, General and Administrative	$2.9	$3.1	$5.9	$5.7

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 six months ended June 30, 2016 follows:

Expected price volatility	62.2% -82.10%
Risk-free interest rate	1.26% - 1.70%
Weighted average expected life in years	6 years
Dividend yield	—

Summary of Stock Option Activity

Option activity during the six months ended June 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		201,013			4.33
Exercised		(112,425	)		2.00
Forfeitures		(214,722	)		9.64
Outstanding at June 30, 2016		3,366,395		$	5.11	$	874

Summary of Restricted Stock Activity

Restricted stock activity during the six months ended June 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		216,000		2.36
Vested		(104,025)		3.89
Forfeitures		(561,791)		12.45
Outstanding at June 30, 2016		4,946,338	$	8.52