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Fair Value Measurement of Assets and Liabilities - Summary of Company's Financial Instruments, Fair Value on a Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Cash equivalents    
Total cash equivalents $ 35 $ 35
Total assets at fair value   1,302
Money market funds    
Cash equivalents    
Total cash equivalents 35 35
Short-term investments    
Cash equivalents    
Short-term investments   1,267
Level 1    
Cash equivalents    
Total cash equivalents 35 35
Total assets at fair value   1,302
Level 1 | Money market funds    
Cash equivalents    
Total cash equivalents $ 35 35
Level 1 | Short-term investments    
Cash equivalents    
Short-term investments   $ 1,267