Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Investments - Schedule of Available-for-sale Investments by Contractual Maturity Date (Details)

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Cash, Cash Equivalents and Investments - Schedule of Available-for-sale Investments by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Adjusted Cost    
Due in one year or less $ 79,590 $ 92,914
Due after one year through three years   6,251
Total 79,590 99,165
Fair Value    
Due in one year or less 79,580 92,861
Due after one year through three years   6,252
Total $ 79,580 $ 99,113