XML 66 R23.htm IDEA: XBRL DOCUMENT v3.20.1
Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of Fair Value Measurements of Financial Instruments The following tables present the level within the fair value hierarchy at which our financial instruments were measured: 
Fair Value Measurements Using
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Fair Value
As of March 31, 2020(In Thousands)
U.S. Treasury securities and obligations of U.S. government agencies$51,726  $—  $—  $51,726  
Municipal debt securities—  199,935  —  199,935  
Corporate debt securities—  640,448  —  640,448  
Asset-backed securities—  173,107  —  173,107  
Cash, cash equivalents and short-term investments114,677  —  —  114,677  
Total assets$166,403  $1,013,490  $—  $1,179,893  
Warrant liability—  —  1,461  1,461  
Total liabilities$—  $—  $1,461  $1,461  
Fair Value Measurements Using
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Fair Value
As of December 31, 2019(In Thousands)
U.S. Treasury securities and obligations of U.S. government agencies$48,929  $—  $—  $48,929  
Municipal debt securities—  190,216  —  190,216  
Corporate debt securities—  684,881  —  684,881  
Asset-backed securities—  172,642  —  172,642  
Cash, cash equivalents and short-term investments85,361  —  —  85,361  
Total assets$134,290  $1,047,739  $—  $1,182,029  
Warrant liability—  —  7,641  7,641  
Total liabilities$—  $—  $7,641  $7,641  
Roll-Forward of Level 3 Liabilities Measured at Fair Value The following is a roll-forward of Level 3 liabilities measured at fair value:
For the three months ended March 31,
Warrant Liability20202019
(In Thousands)
Balance, January 1$7,641  $7,296  
Change in fair value of warrant liability included in earnings(5,959) 5,479  
Issuance of common stock on warrant exercise(221) (944) 
Balance, March 31$1,461  $11,831  
Schedule of Key Inputs and Assumptions in Option-Pricing Model The following table outlines the key inputs and assumptions used to calculate the fair value of the warrant liability in the Black-Scholes option-pricing model as of the dates indicated.
As of March 31,
20202019
Common stock price$11.61  $25.87  
Risk free interest rate0.23 %
2.21 - 2.31%
Expected life2.06 years
1.67 - 3.06 years
Expected volatility61.4 %
42.3 - 45.7%
Dividend yield%%