Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation - Summary of Status of Company's Stock Option Activity (Detail 1)

v3.8.0.1
Stock-based Compensation - Summary of Status of Company's Stock Option Activity (Detail 1)
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Shares  
Outstanding at December 31, 2016 (in shares) | shares 1,857,012
2017 Grants | shares 1,260,000
Exercised (in shares) | shares 0
Cancelled, expired or forfeited (in shares) | shares (801,977)
Outstanding at December 31, 2017 (in shares) | shares 2,315,035
Exercisable at December 31, 2017 (in shares) | shares 890,384
Weighted Average Exercise Price  
Outstanding at December 31, 2016 (in dollars per share) | $ / shares $ 4.28
Granted (in dollars per share) | $ / shares 1.96
Exercised (in dollars per share) | $ / shares 0.00
Cancelled, expired or forfeited (in dollars per share) | $ / shares 3.14
Outstanding at December 31, 2017 (in dollars per share) | $ / shares 3.41
Exercisable at December 31, 2017 (in dollars per share) | $ / shares $ 4.84
Weighted Average Remaining Contractual Life (Years)  
Weighted Average Remaining Contractual Life at December 31, 2017 7 years 3 months
Exercisable Weighted Average Remaining Contractual Life at December 31, 2017 4 years 8 months 1 day
Intrinsic Value  
Intrinsic Value Outstanding at December 31, 2017 | $ $ 497,700
Intrinsic Value Exercisable at December 31, 2017 | $ $ 0