Notes Payable and advances from related parties - Additional Information (Detail) (USD $)	9 Months Ended		3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014	Dec. 31, 2013	Feb. 10, 2012	Jan. 17, 2012
Secured Convertible Notes Payable [Line Items]
Notes payable, refinanced with LANB principal and accrued interest					$ 708,000
Notes Payable, Total	482,000
Interest expense, Other	1,761,000	1,349,000
Notes Payable, Related Parties, Current	623,000
Interest Rate On Capital Lease For Equipment	7.25%
Capital Leased Assets, Gross	12,800			12,800
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	2,910			1,165
Promissory Notes
Secured Convertible Notes Payable [Line Items]
Interest expense, Other	25,000
Debt Instrument, Maturity Date, Description	maturing on April 2015.
MIT
Secured Convertible Notes Payable [Line Items]
Note payable						700,000
MIT | Promissory Notes
Secured Convertible Notes Payable [Line Items]
Monthly payment to LANB on promissory note			$ 10,000
Interest rate on promissory note			5.50%