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Cash, Cash Equivalents and Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2019
Cash and Cash Equivalents [Abstract]  
Amortized Cost and Fair Value of Cash, Cash Equivalents and Marketable Securities The following table summarizes the amortized cost and the estimated fair value of our cash, cash equivalents and marketable securities as of March 31, 2019 and December 31, 2018 (in thousands):
Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
March 31, 2019
Current assets:
Cash$11,353 $— $— $11,353 
Cash equivalents:
Commercial paper15,945 — — 15,945 
Money market funds21,005 — — 21,005 
U.S. Treasuries9,985 — — 9,985 
Total cash equivalents46,935 — — 46,935 
Total cash and cash equivalents58,288 — — 58,288 
Marketable securities:
Commercial paper176,705 — — 176,705 
Corporate debt securities83,904 231 (19)84,116 
Certificate of deposits48,744 — — 48,744 
U.S. Treasuries112,681 161 — 112,842 
Total marketable securities422,034 392 (19)422,407 
Total cash, cash equivalents and marketable securities$480,322 $392 $(19)$480,695 
Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
December 31, 2018
Current assets:
Cash and cash equivalents:
Cash$5,222 $— $— $5,222 
Money market funds63,232 — — 63,232 
Total cash and cash equivalents68,454 — — 68,454 
Marketable securities:
Commercial paper152,940 — — 152,940 
Corporate debt securities60,622 58 (75)60,605 
Certificate of deposits128,647 — — 128,647 
U.S. Treasury securities103,521 31 (11)103,541 
Total marketable securities445,730 89 (86)445,733 
Total cash, cash equivalents and marketable securities$514,184 $89 $(86)$514,187 
Cost and Fair Value of Marketable Securities
The following table summarizes the cost and fair value of marketable securities based on stated effective maturities as of March 31, 2019 (in thousands):
Amortized Cost
Fair Value
Due within one year$356,954 $357,120 
Due between one and two years65,080 65,287 
Total$422,034 $422,407