Annual report pursuant to Section 13 and 15(d)

Cash, Cash Equivalents, and Short-term Investments - Unrealized Gain (Loss) on Investments (Details)

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Cash, Cash Equivalents, and Short-term Investments - Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Aggregated Cost Basis $ 34,098 $ 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses (79) 0
Aggregated Fair Value 34,019 0
U.S. investment grade bonds    
Schedule of Available-for-sale Securities [Line Items]    
Aggregated Cost Basis 24,531 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses (54) 0
Aggregated Fair Value 24,477 0
Developed investment grade bonds    
Schedule of Available-for-sale Securities [Line Items]    
Aggregated Cost Basis 9,567 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses (25) 0
Aggregated Fair Value $ 9,542 $ 0