Prepaid expenses and other current assets (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Prepaid expenses and other current assets
Prepaid insurance	$ 406,000	$ 611,000
Prepaid contractor fees and vendor advances	235,000	148,000
Recoupable deposits and other	174,000	285,000
Prepaid expenses and other current assets	815,000	1,044,000
Prepaid insurance included in non-current assets	$ 100,000	$ 200,000

The total of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer, and the aggregate carrying amount of current assets, as of the balance sheet date, not separately presented elsewhere in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

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Carrying amount as of the balance sheet date of unamortized costs of insurance coverage, which will be charged against earnings ratably over the period in which contractually agreed upon coverage's will be in effect; such periods expire within one year or the normal operating cycle, if longer.

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