XML 58 R39.htm IDEA: XBRL DOCUMENT v3.3.1.900
Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Consulting and Histopathology Services [Member]      
Related Party Transaction [Line Items]      
Expenses for consulting and histopathology services $ 456 $ 664 $ 452
Consulting And Contract Research Services [Member]      
Related Party Transaction [Line Items]      
Accounts payable or accrued expenses $ 55 $ 94