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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2020 and December 31, 2019.
(in thousands)    Reported as:
June 30, 2020Amortized
Cost		Unrealized
Gain		Unrealized
(Loss)		Fair ValueCash &
Cash
Equivalents		Available-for-sale securitiesLong-
term
Restricted
Cash
Cash$17,036  $—  $—  $17,036  $14,849  $—  $2,187  
Level I:
Money market funds
251,805  —  —  251,805  245,145  —  6,660  
Level II:
Corporate bonds
137,047  404  (13) 137,438  —  137,438  —  
U.S. treasury securities
495,473  905  (16) 496,362  —  496,362  —  
U.S. government agency securities
50,866  26  (6) 50,886  —  50,886  —  
Commercial paper
124,410  1  —  124,411  53,989  70,422  —  
Subtotal
807,796  1,336  (35) 809,097  53,989  755,108  —  
Total assets measured at fair value on a recurring basis
$1,076,637  $1,336  $(35) $1,077,938  $313,983  $755,108  $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