Notes Payable and advances from related parties - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended	3 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Mar. 31, 2014	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	506,000
Interest expense, Other	1,098,000	899,000
Notes Payable, Related Parties, Current	665,000
Interest Rate On Capital Lease For Equipment	7.25%
Capital Leased Assets, Gross	16,300	16,300
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	1,746	1,165
Promissory Notes
Secured Convertible Notes Payable [Line Items]
Interest expense, Other	17,000
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%