Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Investments - Summary of Available-for-sale Securities' Fair Value and Gross Unrealized Losses (Details)

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Cash, Cash Equivalents and Investments - Summary of Available-for-sale Securities' Fair Value and Gross Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value    
Twelve Months or Less $ 6,249 $ 34,257
More than Twelve Months 0 4,099
Total 6,249 38,356
Gross Unrealized Losses    
Twelve Months or Less (2) (52)
More than Twelve Months 0 (3)
Total (2) (55)
Corporate debt securities    
Fair Value    
Twelve Months or Less 6,249 34,257
More than Twelve Months 0 4,099
Total 6,249 38,356
Gross Unrealized Losses    
Twelve Months or Less (2) (52)
More than Twelve Months 0 (3)
Total $ (2) $ (55)