Annual report pursuant to Section 13 and 15(d)

Common Stock - Summary of Stock Options Activity (Detail)

v3.3.1.900
Common Stock - Summary of Stock Options Activity (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Number of Optioned Common Shares, Beginning Balance 1,283,419 1,007,491 805,281
Number of Optioned Common Shares, Granted 502,047 382,097 239,282
Number of Optioned Common Shares, Expired (247,766) (12,169) (3,061)
Number of Optioned Common Shares, Exercised (5,359) (10,000) (3,475)
Number of Optioned Common Shares, Forfeited (53,120) (84,000) (30,536)
Number of Optioned Common Shares, Ending Balance 1,479,221 1,283,419 1,007,491
Weighted Average Exercise Price, Beginning Balance $ 10.55 $ 11.39 $ 11.34
Weighted Average Exercise Price, Granted 1.91 8.97 11.32
Weighted Average Exercise Price, Expired 2.96 18.93 4.11
Weighted Average Exercise Price, Exercised 2.69 3.00 3.00
Weighted Average Exercise Price, Forfeited 14.37 12.14 13.87
Weighted Average Exercise Price, Ending Balance $ 8.78 $ 10.55 $ 11.39