Quarterly report pursuant to Section 13 or 15(d)

Stock-based compensation - Summary of Status of Company's Restricted Stock Option Activity (Details)

v3.5.0.2
Stock-based compensation - Summary of Status of Company's Restricted Stock Option Activity (Details)
 6 Months Ended
Jun. 30, 2016
$ / shares
shares
Shares  
Beginning balance (in shares) 1,672,578
Granted (in shares) 1,250,000
Cancelled, expired, or forfeited (in shares) (296,066)
Ending balance (in shares) 2,626,512
Exercisable at end of period (in shares) 749,205
Weighted Average Exercise Price  
Granted (in dollars per share) | $ / shares $ 2.75
Cancelled, expired, or forfeited (in dollars per share) | $ / shares 4.88
Ending balance (in dollars per share) | $ / shares $ 4.06
Restricted Stock  
Shares  
Beginning balance (in shares) 0
Granted (in shares) 787,500
Cancelled, expired, or forfeited (in shares) (26,250)
Ending balance (in shares) 761,250
Exercisable at end of period (in shares) 0
Weighted Average Exercise Price  
Granted (in dollars per share) | $ / shares $ 2.73
Cancelled, expired, or forfeited (in dollars per share) | $ / shares 2.73
Ending balance (in dollars per share) | $ / shares $ 2.73