XML 96 R74.htm IDEA: XBRL DOCUMENT v3.6.0.2
Warrants - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
May 12, 2016
May 31, 2016
Dec. 31, 2016
Class of Warrant or Right [Line Items]      
Fair value of warrants liability   $ 44.7  
Exercise price of warrants   $ 7.50 $ 13.05
Class of warrants exercised     0
A Warrants      
Class of Warrant or Right [Line Items]      
Fair value of warrants liability $ 12.8   $ 7.4
Class of warrants expiration period upon issuance   2 years  
Valuation technique     Monte Carlo valuation pricing model
Warrant liability fair value assumptions, risk-free rate 0.76%   1.10%
Warrant liability fair value assumptions, dividend yield 0.00%   0.00%
Warrant liability fair value assumptions, remaining term 2 years   1 year 4 months 24 days
Warrant liability fair value assumptions, volatility rate 95.00%   118.00%
Warrant liability fair value assumptions, assumed probability 10.00%   10.00%
Warrant fair value adjustments     $ 5.4
B Warrants      
Class of Warrant or Right [Line Items]      
Fair value of warrants liability $ 5.0    
Class of warrants expiration period upon issuance   30 months  
Warrants exercisable date   2017-05  
Maximum | A Warrants      
Class of Warrant or Right [Line Items]      
Warrants to purchase of common stock   7,281,553  
Maximum | B Warrants      
Class of Warrant or Right [Line Items]      
Warrants to purchase of common stock   2,427,184  
Registered Offering      
Class of Warrant or Right [Line Items]      
Number of shares sold in underwritten public offering   9,708,737