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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of Fair Value by Significant Investment Category
The following table summarizes the Company’s cash and available-for-sale securities’ amortized cost, unrealized gains (losses), and fair value by significant investment category reported as cash and cash equivalents, restricted cash, or available-for-sale securities as of March 31, 2020 and December 31, 2019.

(in thousands)    Reported as:
March 31, 2020Amortized
Cost		Unrealized
Gain		Unrealized
(Loss)		Fair ValueCash &
Cash
Equivalents		Available-for-sale securitiesLong-
term
Restricted
Cash
Cash$6,398  $—  $—  $6,398  $4,211  $—  $2,187  
Level I:
Money market funds
62,449  —  —  62,449  55,789  —  6,660  
Level II:
Corporate bonds
116,125  12  (456) 115,681  —  115,681  —  
U.S. treasury securities
282,330  1,831  —  284,161  —  284,161  —  
U.S. government agency securities
55,442  96  —  55,538  10,000  45,538  —  
Commercial paper
72,474  —  —  72,474  39,063  33,411  —  
Subtotal
526,371  1,939  (456) 527,854  49,063  478,791  —  
Total assets measured at fair value on a recurring basis
$595,218  $1,939  $(456) $596,701  $109,063  $478,791  $8,847  

(in thousands)Reported as:
December 31, 2019Amortized
Cost		Unrealized
Gain		Unrealized
(Loss)		Fair
Value		Cash &
Cash
Equivalents		Available-for-sale securitiesLong-term
Restricted
Cash
Cash$24,631  $—  $—  $24,631  $24,631  $—  $—  
Level I:
Money market funds
32,856  —  —  32,856  26,196  —  6,660  
Level II:
Corporate bonds
84,054  22  (30) 84,046  —  84,046  —  
U.S. treasury securities
311,083  151  (23) 311,211  —  311,211  —  
U.S. government agency securities
95,380  17  —  95,397  22,549  72,848  —  
Commercial paper
95,467  —  —  95,467  65,600  29,867  —  
Subtotal
585,984  190  (53) 586,121  88,149  497,972  —  
Total assets measured at fair value on a recurring basis
$643,471  $190  $(53) $643,608  $138,976  $497,972  $6,660