Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Option pricing model (Detail)

v3.20.1
Fair Value Measurements - Option pricing model (Detail)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Caelum [Member] | Measurement Input, Price Volatility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Expected volatility 70.00%  
Caelum [Member] | Convertible Debt [Member] | Measurement Input, Risk Free Interest Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Risk-free interest rate   2.302%
Caelum [Member] | Convertible Debt [Member] | Measurement Input, Expected Dividend Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Expected dividend yield   0.00%
Caelum [Member] | Convertible Debt [Member] | Measurement Input, Expected Term [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Expected term in years   3 months 26 days
Caelum [Member] | Convertible Debt [Member] | Measurement Input, Price Volatility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Expected volatility   67.00%
Caelum [Member] | Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member] | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Risk-free interest rate   2.905%
Caelum [Member] | Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member] | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Risk-free interest rate   2.909%
Caelum [Member] | Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Expected dividend yield   0.00%
Caelum [Member] | Warrants [Member] | Measurement Input, Expected Term [Member] | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Expected term in years   3 years 10 months 2 days
Caelum [Member] | Warrants [Member] | Measurement Input, Expected Term [Member] | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Expected term in years   3 years 11 months 16 days
Caelum [Member] | Warrants [Member] | Measurement Input, Price Volatility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Expected volatility   70.00%
Cyprium [Member] | Warrants [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Probability of issuance of the warrant 5.00% 0.00%
Cyprium [Member] | Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Risk-free interest rate 1.92% 0.00%
Cyprium [Member] | Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Expected dividend yield 0.00% 0.00%
Cyprium [Member] | Warrants [Member] | Measurement Input, Expected Term [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Expected term in years 10 years 0 years
Cyprium [Member] | Warrants [Member] | Measurement Input, Price Volatility [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Expected volatility 93.00% 0.00%