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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Debt [Line Items]        
Interest $ 26 $ 0 $ 26 $ 0
Amortization of fees 28 0 28 0
Financing fees     491 0
Interest and Debt Expense, Total 54 0 54 0
Interest expense related to the Hercules loan 689 350 1,838 1,033
LOC Fees [Member]        
Debt [Line Items]        
Interest 3 0 10 0
Interest and Debt Expense, Total 3 0 10 0
IDB Note [Member]        
Debt [Line Items]        
Interest 84 82 243 235
Amortization of fees 0 1 1 3
Interest and Debt Expense, Total 84 83 244 238
NSC Debt [Member]        
Debt [Line Items]        
Interest 145 208 456 488
Amortization of fees 135 59 557 140
Interest and Debt Expense, Total 280 267 1,013 628
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]        
Interest 26 0 26 0
Financing fees 242 0 491 0
Interest and Debt Expense, Total $ 268 $ 0 $ 517 $ 0