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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2012

Summary of Significant Accounting Policies [Abstract]

Estimated Useful Lives of Property and Equipment


	Estimated useful lives
Machinery and equipment		3-20 years
Furniture and fixtures		5-7 years
Computers and software		3-7 years
Leasehold improvements		5 years

Valuation Assumptions Used in Computation of Stock Option Expense


	Six Months Ended June 30,
	2012			2011
Expected volatility		75.8 – 81.1	%		71.9 – 84.7	%
Weighted-average volatility		76.0	%		81.3	%
Risk-free interest rate		0.4 – 0.9	%		0.7 – 2.2	%
Expected dividend		0	%		0	%
Expected life in years		3.5 – 8.6			3.5 – 8.6

- Definition

Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References+ Details