Annual report pursuant to Section 13 and 15(d)

Stock-based compensation - Summary of status of company's stock option activity (Details)

v3.3.1.900
Stock-based compensation - Summary of status of company's stock option activity (Details) - Employee Stock Option [Member] - USD ($)
 1 Months Ended 12 Months Ended
Nov. 30, 2014
Aug. 31, 2014
Jun. 30, 2014
Feb. 28, 2014
Dec. 31, 2015
Shares          
Beginning balance outstanding (in shares)         2,024,078
Granted (in shares) 115,000 275,000 690,000 200,000 0
Exercised (in shares)         0
Cancelled, expired, or forfeited (in shares)         (351,500)
Ending balance outstanding (in shares)         1,672,578
Exercisable (in shares)         652,997
Weighted Average Exercise Price          
Beginning balance outstanding (in dollars per share)         $ 5.05
Granted (in dollars per share) $ 4.90 $ 5.00 $ 4.85 $ 6.00 0.00
Exercised (in dollars per share)         0.00
Cancelled, expired, or forfeited (in dollars per share)         5.41
Ending balance outstanding (in dollars per share)         4.97
Exercisable (in dollars per share)         $ 5.01
Weighted Average Remaining Contractual Life (Years)          
Outstanding         8 years 2 months 1 day
Exercisable         8 years 1 month 5 days
Intrinsic Value          
Outstanding         $ 0
Exercisable         $ 0