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Stock-based compensation - Restricted Stock (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Mar. 31, 2013
Additional disclosures      
Cash used to settle tax on restricted stock liability awards   $ 5,000  
Restricted Stock Units      
Additional disclosures      
Fair value of shares vested $ 0 65,000  
Unrecognized stock-based compensation expense $ 0 $ 0  
Granted (in shares) 0 0  
Unvested RSUs with amended terms     697,060
Cash used to settle tax on restricted stock liability awards $ 0 $ 5,000  
Remaining tax liability relating to awards $ 0 $ 0