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Severance Charge (Details) (USD $)	3 Months Ended		9 Months Ended
Severance Charge (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Severance Charge [Line Items]
Compensation and benefits			$ 679,000
Stock-based compensation expenses related to accelerated vesting			831,000	0
Total severance charge	$ 1,510,000	$ 0	$ 1,510,000	$ 0

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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