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Commitments and contingencies - Additional information (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended
Feb. 20, 2013
Mar. 24, 2014
Advantar Laboratories, Inc. [Member]
Feb. 20, 2013
Sublicensed Technology [Member]
Feb. 20, 2013
Licensed Product [Member]
Mar. 31, 2014
Rostislav Raykov
Issue Of Convertible Common Stock As Per License Agreement. 13,902        
Expired Convertible Common Stock 21,250        
Royalty Percent     5.00% 2.50%  
Discount On Royalty Percent       1.00%  
Minimum Amount To Be Bought To Get Discount On Royalty       $ 150  
Milestone Payment Fees 100        
Research and Development Expense, Total   42      
Severance Costs Payable In Case Of Termination Other Than For Cause         $ (160)