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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Financial Assets Measured at Fair Value on a Recurring Basis
Financial assets measured at fair value on a recurring basis were as follows (in thousands):
Fair Value Measurements at June 30, 2019
Quoted Prices in Active Markets for Identical AssetsSignificant Other Observable InputsSignificant Unobservable Inputs
TotalLevel 1Level 2Level 3
Assets:
Money market funds$55,663 $55,663 $— $— 
Government-sponsored enterprises20,927 — 20,927 — 
Corporate debt securities84,356 — 84,356 — 
Common stock warrants22,356 — — 22,356 
Total assets measured at fair value(a)
$183,302 $55,663 $105,283 $22,356 
Fair Value Measurements at December 31, 2018
Quoted Prices in Active Markets for Identical AssetsSignificant Other Observable InputsSignificant Unobservable Inputs
TotalLevel 1Level 2Level 3
Assets:
Money market funds$46,257 $46,257 $— $— 
U.S. Treasury securities12,488 — 12,488 — 
Corporate debt securities100,214 — 100,214 — 
Common stock warrants1,890 — — 1,890 
Total assets measured at fair value(b)
$160,849 $46,257 $112,702 $1,890 
(a) Total assets measured at fair value at June 30, 2019 includes approximately $69.1 million reported in cash and cash equivalents and $22.4 million reported in other assets on the balance sheet.
(b) Total assets measured at fair value at December 31, 2018 includes approximately $146.2 million reported in cash and cash equivalents on the balance sheet and $1.9 million reported in other assets on the balance sheet.