Quarterly report pursuant to Section 13 or 15(d)

Debt and Interest - Schedule of Interest Expenses for Debt Arrangements (Detail)

v3.5.0.2
Debt and Interest - Schedule of Interest Expenses for Debt Arrangements (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Debt [Line Items]        
Financing fees     $ 249 $ 0
Interest expense related to the Hercules loan $ 529 $ 352 1,149 683
LOC Fees [Member]        
Debt [Line Items]        
Interest 3 0 7 0
Interest and Debt Expense, Total 3 0 7 0
IDB Note [Member]        
Debt [Line Items]        
Interest 79 82 159 153
Amortization of fees 0 1 1 2
Interest and Debt Expense, Total 79 83 160 155
NSC Debt [Member]        
Debt [Line Items]        
Interest 144 208 311 279
Amortization of fees 54 61 422 82
Interest and Debt Expense, Total 198 269 733 361
Ovamed [Member]        
Debt [Line Items]        
Interest 0 0 0 167
Interest and Debt Expense, Total 0 0 0 167
Helocyte Convertible Note [Member]        
Debt [Line Items]        
Financing fees 249 0 249 0
Interest and Debt Expense, Total $ 249 $ 0 $ 249 $ 0