Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Changes in Fair Value of Financial Instruments (Detail)

v3.5.0.2
Fair Value Measurements - Changes in Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance     $ 2,599 $ 4,160
Additions during the period     1,099  
Change in fair value of investments     (1,719) 1,407
Fair value adjustment of Contingently Issuable Warrants $ 0 $ 0 89 0
Balance 2,068 5,567 2,068 5,567
Warrant liabilities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance     0  
Additions during the period     99  
Fair value adjustment of Contingently Issuable Warrants     0  
Balance 99   99  
Contingently Issuable Warrants [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance     114 0
Additions during the period     0  
Change in fair value of investments     0 0
Fair value adjustment of Contingently Issuable Warrants     89 0
Balance 203 0 203 0
Helocyte Convertible Note, At Fair Value [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance     0 0
Additions during the period     1,000  
Change in fair value of investments     0 0
Fair value adjustment of Contingently Issuable Warrants     0 0
Balance 1,000 0 1,000 0
Investment In Laser Device [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance     250 250
Additions during the period     0  
Change in fair value of investments     0 0
Fair value adjustment of Contingently Issuable Warrants     0 0
Balance 250 250 250 250
Investment In Origo [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance     2,235 3,910
Additions during the period     0  
Change in fair value of investments     (1,719) 1,407
Fair value adjustment of Contingently Issuable Warrants     0 0
Balance $ 516 $ 5,317 $ 516 $ 5,317