Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Checkpoint's Contingently Issuable Warrants with option pricing model (Detail)

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Fair Value Measurements - Checkpoint's Contingently Issuable Warrants with option pricing model (Detail)
1 Months Ended 5 Months Ended 12 Months Ended
Oct. 30, 2015
Aug. 31, 2015
Dec. 31, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Risk-free interest rate     0.10%
Expected volatility     9.30%
Checkpoint [Member] | Warrant [Member]      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Risk-free interest rate 2.16% 2.26%  
Expected dividend yield 0.00% 0.00%  
Expected term in years 10 years 10 years  
Expected volatility 100.86% 83.00%  
Probability of issuance of the warrant 100.00% 25.00%