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Balance Sheet Account Detail - Summary of Other Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Equity securities $ 0 $ 37,530
Key employee life insurance – cash surrender value 6,123 10,737
Inventories - non-current portion 3,480 3,100
Promissory note receivable - long term (see Note 10) 1,521 1,517
Income tax receivable 668 668
Research & development supplies and other 1,367 231
Other assets $ 13,159 $ 53,783