Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Derivative Contingently Issuable Warrant liabilities (Detail)

v3.10.0.1
Fair Value Measurements - Derivative Contingently Issuable Warrant liabilities (Detail) - USD ($)
$ in Thousands
4 Months Ended 5 Months Ended 9 Months Ended
Jun. 30, 2018
Mar. 15, 2018
Sep. 30, 2018
Jun. 30, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Payment of convertible notes     $ (4,076)  
Reclassification of warrant to equity     (13,615)  
National [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Fair value at the beginning of period $ 13,615 $ 5,597   $ 5,597
Change in fair value   8,018    
Reclassification of warrant to equity (13,615)      
Fair value at end of period 0 13,615   0
Helocyte [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Fair value at the beginning of period     87  
Change in fair value     (87)  
Fair value at end of period     0  
Helocyte [Member] | Convertible Debt [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Fair value at the beginning of period     4,700  
Payment of convertible notes     (4,076)  
Change in fair value     (291)  
Fair value at end of period     333  
National Warrant Liabilities [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Fair value at the beginning of period   $ 202   202
Trading revenue gain       392
Fair value at end of period $ 594     $ 594
Caelum Convertible Note [Member]        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Fair value at the beginning of period     10,059  
Change in fair value     265  
Fair value at end of period     $ 10,324